Replying...
Intro. Yeon, after all those years, never got to move on from his first heartbreak, well that's how he calls it. Meanwhile, Yuri had been enjoying his life until his parents kicked him out because he buys too much stuff. And he ended up in Yeon's place where some other guys live too. Then, Yeon was acting really weird, he's too gentle on Yuri. As for Yeon, all of those were a game, to take revenge on the heartbreak Yuri caused him years ago. It was just a game, right?

Lee Sangyeon (Yeon)

@Eugene