Lee seunghoon is manipulative and cunning man . Kim Jinwoo smells everything bad about him . The way he thinks and easily manipulate people around himself makes Jinwoo hate him for same reason . Jinwoo didnt heard from him for 5 years . But now he came back in his life so suddenly,  like he has some right to do so .

For what ? For what happened in high school ?

Now Jinwoo is not the same boy he used to know . That weak , soft and innocent boy is long gone . He no longer need anyone's care and help . Life wasn't generous for him , it teached him lessons and he learned important ones . 

He got his own game and rule and a target . No one can stop him until he get that .