I love ot4 junior quartet like it's just so great
Because you have zhuiyi which is like childhood best friends to lovers, "i cause problems" and "i fix the problems", soft mom friend + chaotic stupid. Their relationship naturally progresses from best friends to lovers, but they're both stupid in love matters, so they don't realize they're basically dating for a while
Then you have zhuiling which is like soft boy + tsundere who is struggling to tsundere because soft boy is so soft he forgets to be tsundere sometimes. It's also extra rich boy x (idk?) boy, so you have one constantly finding reasons to dote on the other, and the other not realizing it means that the rich boy got a crush
Then you have zhuizhen which is like sticking the soft boy mom friend together with the half time mom friend half time chaotic stupid (jingyi level) and sometimes both at once. Their relationship is all levels of soft, and sometimes they're the only voices of reason
Then there's lingyi which sticks together tsundere boy and chaotic stupid boy and slaps on a love-hate relationship and turns chaotic stupid boy tsundere only for tsundere boy. They thrive off insulting each other, but if someone else insulted or hurt the other they would go ham like "I'M THE ONLY ONE ALLOWED TO INSULT HIM LIKE THAT". Both would go crazy in rage if the other was hurt, but they also wouldn't admit it. They play pranks on each other all the time. They heavily deny having crushes on each other, and sometimes Jin Ling buys Lan Jingyi stuff but won't admit he was the one who bought it. Jingyi is half "Ooh you wanna kiss me so bad" and "who would kiss you?", and Jin Ling is just "Who would kiss you?"
Then zhenling which is tsundere boy + half mom friend half chaotic stupid, so sometimes they're like zhuiling and have such a sweet relationship where Jin Ling forgets he's a tsundere, sometimes they have a bit of that love-hate double tsundere thing going on, sometimes Zhizhen acts like his mom, and other times they team up to prank Jingyi
Then there's zhenyi which is chaotic stupid soft boy + half mom friend half chaotic stupid, so half the time Zizhen is the voice of reason and they have a zhuiyi like relationship, and half the time they're like chaotic stupid bros who pull pranks on each other in good fun or team up to prank Jin Ling. They can be very ride or die at times, and they can also be really soft
So then you stick zhuilingyizhen together and you have this best friend group formed under interesting circumstances that became ride or die pretty fast with multiple different dynamics, but it's filled with so much love and chaos. It's romantic time with the boys and despite the different dynamics they all love each other