Theory proves highschool is where you meet your friends for life. Six best friends realise they have a lot more in common than just pranks and the urge to skip school when they witness the murder of an important figure in their town. The only problem is they didn't catch a glimpse of the killer but he knows who they are. Now they're stuck in his game. The rules are simple. You break them, you die.....

Yoosung Kim - The youngest boy in the Mystic Messenger, 21 yrs. old, childish, loves to play LOLOL. Mystic Messenger ( credits to Cheritz Team ) Yoosung Kim x Reader " My Childish Boyfriend. "