summary: Weak Hero Boys reaction to finding out you have cheated on them.
type: kdrama, weak hero, headcanons
Yeon Sieun
The moment Sieun finds out, the world does not seem to stop. It simply becomes quieter. There is no shouting, no demand for explanations, no dramatic confrontation in front of everyone. He just stares at you with an expression so unreadable that it becomes terrifying. For a long moment, he says nothing at all, and somehow that silence hurts infinitely more than if he had screamed. His mind begins reconstructing everything with ruthless precision. Every late reply. Every canceled plan. Every moment you seemed distracted. Every lie you thought you buried. He realizes he had trusted you so much that he never bothered looking for cracks, and that realization humiliates him more than the betrayal itself. He hates that he missed it. He hates that someone managed to make him look foolish.
When he finally speaks, his voice is painfully calm. Almost detached. He asks one question after another, not because he hopes to fix the relationship, but because he needs to understand exactly how long he had been living inside a lie. Every answer chips away at something inside him until there is nothing left to protect. The worst part is that he never cries in front of you. He simply looks exhausted, as though someone reached inside him and quietly removed every feeling he had ever associated with your name. After that conversation, he leaves. There are no second chances. No late-night calls. No dramatic messages asking you to come back. You simply become someone he used to know. If he ever sees you again months later, he acknowledges you with the same detached politeness he would offer a stranger asking for directions. The tragedy is not that he hates you. It is that he trains himself to feel absolutely nothing at all.
Ahn Suho
Suho's first reaction is disbelief. Genuine, painful disbelief. He laughs once because the truth sounds so absurd that his brain refuses to process it. He asks if you're joking. Then he sees your face, and that laugh dies almost immediately. The hurt reaches him all at once. Unlike Sieun, Suho wears every emotion openly. You watch his expression collapse in real time, confusion turning into heartbreak with almost unbearable transparency. His hands run through his hair as he begins pacing because standing still suddenly feels impossible. He keeps asking why, not because he expects a satisfying answer, but because he cannot understand how the person he loved enough to imagine a future with could willingly become the person who destroyed it.
He is angry, but not in the explosive sense. His anger comes from disappointment. From feeling stupid for defending you, trusting you, believing in you without hesitation. He remembers every time someone warned him to be careful, every joke his friends made about loving too easily, and he realizes they had all been wrong for one reason. They underestimated how much this would actually destroy him. Even then, part of him still wants you to tell him there was some misunderstanding because he desperately wants reality to become something else. But once he realizes the betrayal truly happened, something inside him gives up. He tells you quietly that he hopes whoever you chose was worth losing everything you built together. Then he walks away because staying any longer would only make him beg for answers that no longer matter. He never contacts you again, though for months afterward, he instinctively reaches for his phone whenever something funny happens before remembering you no longer belong there.
Jeon Seokdae
Seokdae does not react immediately because shock renders him almost motionless. He simply stands there, looking at you with an expression that seems almost vacant. It is the kind of silence born from someone whose entire understanding of reality has just been shattered. Loyalty has always been sacred to him. It is the foundation upon which he builds every relationship, romantic or otherwise. To discover that the one person he lowered his guard around willingly betrayed that trust feels almost incomprehensible. He keeps wondering what he missed. Whether he wasn't enough. Whether there was some moment where he unknowingly pushed you away. The self-blame arrives before the anger ever does.
Eventually, however, the sadness gives way to quiet resolve. He refuses to beg. He refuses to compete with another man for someone who has already made her choice. His heartbreak is immense, but so is his dignity. He calmly returns every belonging you left at his apartment, neatly folded exactly the way you once liked them. If you cry, he cannot even bring himself to comfort you because the instinct that once came so naturally now feels misplaced. Before leaving, he simply tells you that he genuinely hopes you never experience what you made him feel today. It is not a curse. It is not revenge. It is simply the deepest wound he knows how to describe. Afterward, he disappears from your life completely, carrying the heartbreak with remarkable grace while privately questioning whether trusting anyone that deeply was ever a mistake.
Kang Wooyoung
Wooyoung reacts with fire. The moment he learns the truth, every ounce of composure evaporates. He demands names. Demands timelines. Demands every ugly detail because the uncertainty drives him insane. He raises his voice, pacing the room like a caged animal while trying to understand how you could smile at him one day and choose someone else the next. He laughs bitterly whenever you apologize because those words suddenly feel meaningless. Apologies belong before betrayal, not after it. His pride takes an enormous hit. The idea that another man knew something about his own relationship before he did makes him furious beyond words.
For a brief moment, he considers forgiving you. Not because he thinks you deserve it, but because he loves you enough that the thought of losing you feels unbearable. That possibility dies the second he realizes forgiveness would mean questioning everything forever. Every late night. Every message. Every smile. He refuses to become that version of himself. Before walking away, he tells you that you didn't just break his heart. You permanently changed the way he would love the next person who came into his life. That realization hurts him more than losing you because he knows someone innocent will eventually inherit the trust issues you created. He leaves angry, but beneath all that rage is a young man mourning the future he thought he was building with you.
Park Humin (Baku)
Humin is devastated in the most human way possible. He keeps trying to understand it because he genuinely cannot believe someone he loved would willingly hurt him like this. Even while confronting you, there is still hope lingering behind his eyes. Hope that he had misunderstood the accusation. Hope that someone lied. Hope that reality somehow shifts before the conversation ends. But every answer you give slowly kills that hope until all that's left is heartbreak so raw it becomes difficult to witness. He asks whether you were ever truly happy with him or whether he had simply been convenient until someone more exciting appeared. He does not ask to manipulate you. He asks because he truly needs to know whether your memories together meant as much to you as they did to him.
When he finally accepts the truth, tears come before anger ever does. He is not embarrassed by them. He simply cannot stop them. Loving someone wholeheartedly means losing them wholeheartedly too. He admits that if you had simply fallen out of love, he would have accepted it eventually. But betrayal feels different because it rewrites every beautiful memory into something suspicious. The dates, the laughter, the hugs, every "I love you" suddenly becomes impossible to revisit without wondering if someone else already existed in the background. That thought breaks him. Even after ending the relationship, he struggles to hate you. Instead, he mourns the version of you he thought existed, quietly accepting that perhaps the person he loved had never truly been real.
Go Hyuntak (Gotak)
Hyuntak's anger arrives immediately, violently enough that he has to physically remove himself from the situation before saying something he cannot take back. His fists clench so tightly his knuckles turn white, his breathing uneven as he forces himself toward the nearest exit. He knows himself well enough to recognize that staying would only escalate things. Once he calms down enough to return, his voice becomes surprisingly controlled, though every word carries immense disappointment. He asks whether you ever intended to tell him yourself or whether he would have spent years living inside a lie if nobody else had spoken up.
More than anything, he feels embarrassed. Hyuntak loves proudly. Loudly. He introduced you to everyone important in his life, defended you whenever anyone criticized you, and built your relationship into something he genuinely believed would last. Realizing he unknowingly became the fool in someone else's story crushes his confidence. When the relationship ends, he cuts contact immediately because he knows lingering would only reopen wounds that deserve to heal. It takes him years before he fully trusts another partner again. The betrayal becomes something he carries quietly, hidden beneath the same dependable exterior everyone else still sees.
Geum Seongje
Seongje reacts in a way that is almost unsettling. At first, he smiles. It is not a happy smile. It is the kind that appears when someone is trying very hard not to let genuine pain show. He chuckles under his breath, shaking his head as though the situation has become absurdly ironic. "Seriously?" he asks. "That's how this ends?" His amusement lasts only seconds before disappearing completely. The room suddenly feels dangerous because his emotions have become impossible to predict. He starts asking questions that sound almost casual, but every answer clearly feeds something darker inside him. He wants to know who it was. How long it lasted. Whether you laughed about him together. Whether the other man knew you were taken.
Unlike most people, Seongje does not immediately walk away. He lingers. Not because he wants to fix things, but because part of him becomes obsessed with understanding why someone he let this close chose to destroy him. His pride refuses to let the story end with him simply being discarded. Eventually, however, even he realizes there is no satisfying explanation. You cheated because you chose to. That simplicity enrages him. He leaves with a bitter smile, telling you that one day you'll wake up beside someone new and wonder whether they're doing exactly what you once did to him. It isn't revenge. It's simply the loss of innocence. Because after living through betrayal himself, he no longer believes people who betray once ever truly escape the fear of being betrayed in return.
Na Baekjin
Baekjin's reaction is terrifying precisely because it lacks visible emotion. When he learns the truth, his expression changes so little that, for several unbearable seconds, you wonder whether he even heard you. He simply studies you. Quietly. Patiently. Like someone examining a complicated equation that has finally revealed its hidden answer. Then he begins asking questions with unnerving precision. Not emotional questions. Factual ones. Dates. Places. Names. Timelines. Every lie you ever told him is methodically placed into its proper position until the entire relationship is reconstructed into something unrecognizable. By the end of the conversation, he understands exactly where your loyalty ended and your deception began.
When he finally speaks about his own feelings, his voice remains perfectly level. He tells you that betrayal is irreversible because trust is not something that regenerates once broken. It either exists or it doesn't. He admits, almost clinically, that the greatest disappointment is not losing you but realizing his own judgment failed. He believed you were someone worthy of absolute trust, and that mistake bothers him far more than heartbreak itself. Before leaving, he quietly returns every gift you ever gave him. Not out of spite, but because he refuses to keep reminders of a relationship that no longer existed in the form he believed it did. Afterward, you cease to exist in his life with startling efficiency. Your number disappears. Your photographs vanish. Your name is never spoken again. It is as though he performs emotional surgery on himself, removing every trace of you with the same calculated precision he applies to everything else. Whether it truly stops hurting is something only he will ever know.
Baek Dongha
Dongha goes unnervingly quiet. He doesn't throw accusations around the room or demand an emotional confession. Instead, he sits back, staring at you with an expression that slowly hardens the more you speak. He has always been good at reading people, and once he realizes you're telling the truth, he also realizes something else. He had noticed the small inconsistencies before. The changed routines. The moments when your attention wandered somewhere else. He simply chose to trust you instead of his instincts. That realization irritates him more than anything because he prides himself on seeing through people. You managed to become the exception.
When he finally stands, there is an almost detached calmness about him that makes the conversation feel colder than if he had exploded. He tells you that cheating is a choice made over and over again, not a single mistake that happened in one unfortunate moment. Every message, every meeting, every lie required another decision, and somewhere along that chain of choices, you stopped choosing him. He doesn't insult you. Doesn't call you names. He simply concludes that the version of you he loved no longer exists, if it ever did at all. Then he leaves without looking back. The most painful part comes afterward. He never blocks you. Never changes his number. He simply never answers again, no matter how many times you try to reach him.
Do Seongmok
Seongmok says almost nothing when he learns you've cheated. At first, you mistake his silence for shock, but as the minutes pass, you realize it is something much heavier. He simply looks at you with an expression that carries more disappointment than words ever could. He had loved you with remarkable simplicity. There were no games, no tests, no complicated conditions. His loyalty had always been absolute, and because of that, betrayal strikes him with devastating force. He doesn't ask who the other man is. He doesn't ask why. Somewhere deep down, he understands that no explanation will ever make this hurt less. When he finally speaks, his voice is quiet enough that you almost miss it.
"I would've never."
Nothing more. Just four words. Four words that somehow contain every promise he had made to you without ever saying them aloud. He gathers the few belongings he still has at your place, moving slowly as though each object carries another memory he no longer knows what to do with. Before walking out the door, he pauses for only a second, his hand resting on the frame. For a moment, it almost looks as though he wants to turn around. To ask if any part of your love had been real. But he doesn't. Some answers are too painful to hear, and others no longer matter. The door closes softly behind him, and that gentle sound becomes the final ending to a relationship he had believed would last far longer than it ever did.
seongje would steal sieun’s clothes as a ploy to force sieun into his own clothes instead. oh, it’s cold out, and sieun couldn’t find his jacket—or any of his jackets—so he’s quietly suffering through the weather? too bad, seongje is wrangling sieun’s arms into his windbreaker and zipping it up before sieun can shove it off. hunches over sieun from behind and sticks his hands into the windbreaker pockets to keep them warm… but mostly its so sieun is stuck in his arms, and keeps seongje a little warm too, huddle together like that. (maybe seongje could’ve picked a warmer night for this… oh well.) seongje will sometimes wear sieun’s clothes just to stretch it out and piss sieun off, because now his clothes truly don’t fit properly, too baggy to be called fashionable. what is seongje’s is sieun’s and what is sieun’s is seongje’s.
weak hero class alternative ending where beomseok accepts a part time job at the restaurant where suho works and learns to love himself by becoming the best dishwashing guy ever
all he needed was an accepting familial figure and this could have been it. boom. coma avoided
