S.Coups: He was surprised when his ex showed up at the same cafe you were at for your date. Though you didn't want to make a scene, he wanted to leave because he knew that they weren't a good person. When going to leave, they stopped him. They looked you up and down before having the audacity to ask him if he wanted to get back together. Obviously, he moved on and strickly told them no before leaving.
Jeonghan: He didn't think much of it when his ex showed up to their concert since they kind of ended on good terms. However, they don't seem to be over him as they corner him backstage. They try to convince him that they were meant to be together. Jeonghan was uncomfortable and proceeded to tell them that he moved on. They weren't happy and stormed out. He walked back into the dressing room and walked up to you telling you what happened.
Josh: He knew that it would happen because his ex wasn't the happiest when he broke up with them. So when they "happened" to be in the area of the restaurant you were at, he wasn't too happy. Neither of you wanted to leave but you became uneasy and he wanted you to be comfortable. When he went to get the check, his ex came up behind him. They tried to talk to him only to receive the cold shoulder. When he came back, he grabbed your hand and left making sure you were okay.
Jun: It was bizarre because he always thought they ended on good terms. That changed when they showed up at the dorm while you both were having a couple's day. They tried walking in but Jun stopped them deciding to walk outside instead. They tried asking him if he wanted to go out for a while but he explained you were there and that he didn't want to. They didn't take kindly to that and told him he couldn't do better than them. When he walked back in, he simply told you it was no one not wanting you to worry.
Hoshi: He always told you that he would NEVER go back to his ex. He made sure you knew you are his soulmate. So when his ex showed up at the company begging him to come back to them in front of you, you were upset. Hoshi didn't put up with it at all. He yelled at them that he moved on to someone who he can't picture his life without. He made them leave before coming over to you and coddling you before suggesting you both go back to the dorm.
Wonwoo: His ex had been following him and you around the city while you guys were on a date. They walked into the same shop as you. While you were looking at shirts, they grabbed Wonwoo. They started yelling at him that he was cheating and all kinds of crazy things. He called his manager and tried to calm them down. When his manager arrived with the cops, Wonwoo immediately made sure you were okay. You were a little shaken but nothing too bad.
Woozi: He told you straight up that he and his ex didn't end on very good terms. So when they showed up on your date, you weren't too surprised. He simply told you to ignore them while he dragged them out. He told them that they need to move on. They plead with him to take them back but he wasn't having it. Once he gets them to leave, he just shakes his head as you question why he dated them.
DK: He always told you even though he and his ex were friends, he wouldn't ever leave you for them He knew you were the one and wasn't going to risk anything happening to you. So it took him by surprise when his ex tried to get you to break up. He even questioned them to which they told him they wanted him back. He simply told them that they weren't meant to each other and he found his other half. They weren't happy but he made it clear you aren't leaving his life.
Mingyu: He always had a feeling that his ex was a little crazy. It first occurred to him when he broke up with them. They always blamed you for the breakup and for taking him away. He told you he would protect you no matter what. And he was very true to his word when his ex attacked you while out walking around together. He didn't think they would physically hurt you but they proved him wrong. He was quick to pull them away from you and report to both his manager and police what happened.
Minghao: He put up the boundary with his ex when you started dating. Yes, they were still friends but he didn't want you uncomfortable around them. They weren't too happy with this and made sure you both knew that. They also made it their mission to make you question his loyalty sometimes with little comments. He was quick to pick up on that and confronted them. When they told him they wanted him back, he quickly declined, claiming you were together and he wasn't leaving you ever.
Vernon: He and his ex were chill with each other till he started dating you. They were quick to tell him that they were a better couple which caught him off guard. He disagreed with them telling them that you both clicked and were perfect together. They didn't take kindly to that which was Vernon's sign to cut off all contact. They weren't happy and tried to make your life a living hell but he made sure in every aspect of communication you didn't get anything from them.
Seungkwan: He was the one that broke up with them because they were very controlling and he didn't like that. You however were different and that made him fall in love with you. When his ex heard he was dating someone else, they were quick to find you. They tormented you and tried to manipulate his mind to go back to them. However, he was firm on staying with you. He loves you and no one can take him away from you.
Dino: He never pictured having an ex who stopped at nothing to get him back. It made you both feel unsafe everywhere. You were getting calls and threats while he had texts asking him to take them back. He eventually had enough and confronted them. He never backed down and straight-up told them to fuck off. Even when they got on their knees to beg, he walked away. He made it a point that he was going back to you and he would never ever leave you for them or anyone else.