In which Kang Yeosang starts his senior year of high school where he meets Choi San and Park Seonghwa. Choi San, a new boy at school with the best grades and someone who tries helping people in any way he can. And Park Seonghwa, the bad boy in school who's training to be an idol, gets the worst grades and doesn't care about anyone else's opinion on him, but secretly cares about what Yeosang thinks about him. One day, Yeosang accidentally pushes Seonghwa, making him break his arm and lose two weeks of dance practice. What happens when Yeosang feels bad about Seonghwa's broken arm and starts taking care of him, but San doesn't like that?

Ever since Matthew was young, his parents have always left him alone in their big house to go on business trips. He hates it, but hides it, knowing that him telling them won't fix anything. Thankfully, ever since he got a boyfriend a few months ago, he has started staying over at his place whenever his parents are gone. What happens when his boyfriend's twin brother, Kim Jiwoong, comes back from abroad, and Matthew has had a little too much to drink, not even being aware his boyfriend has a twin? And what happens when the next day, he and Jiwoong, both wake up with a timer on their wrist, indicating they only have 30 days until it stops. They're not sure what the timer is for, but the only way to stop it is whenever they're together.

In which Seok Matthew is forced into an arranged marriage, but just days before his wedding, he meets Kim Jiwoong, his future fiancés twin brother, and everything changes when he finds out his secret.

Zhang Hao has always been a very happy and cheerful person, despite the heart condition he suffers from, and the pain it causes him. The doctors tell him it's just getting worse for him, so he's not sure when his last day will be, which makes him want to live his life to the fullest. He loves his life. He has loving parents, loving friends, a not so loving fiancé, but that doesn't matter. The point is... he wants to live. Every time he goes to the doctor, he leaves the doctors office with the same sad look on his face. They don't give him too much hope of living. That is until he realizes he's a character in a manhwa, so maybe he can change things? Maybe he can live a happy and healthy life if he tries changing the story? And maybe he can even find someone he really loves, not someone the writer is making him be with. He specially becomes hopeful when he meets a boy with no name, but the number 21 written on his soccer jersey. (This story is inspired by kdrama 'extraordinary you')

In which Kim Gyuvin starts having really bad luck, but it all changes when he's around the new student Shen Ricky.