Kim minyoung is a tortured girl. She lives with her evil step aunt's family,since her mom died when she was little and her dad remarried a new woman but they died in a car crash 3 years ago. She was pretty much a slave for her step aunt's family ,cooking ,cleaning, and torture doll to take their anger out on. No one knows about it since she hids it well. She has no friends. What will happen once she becomes friend with chanyeol the happy virus? Will things take a turn for the better or will they go south.

kim minyoung: the tortured abused girl. Likes to be nice to people but they always take advantage.

Park chanyeol: the New student. Labeled the happy virus.befriends minyoung. Falls for her almost imidiately

Jo kwangmin: secertly likes minyoung. Has.been watching her since they met in the 2nd grade. Cares alot for her.

kim jong in : the kingka of his and minyoung's highschool. Minyoung's step cousin. Abuses her the least has a little crush on minyoung. 

luhan: minyoung's half brother from her mom's side.he lost contact with minyoung eversince she moved in withhis step aunt. Has been searching for her endlessly.

bang sung joon: the oppa minyoung is in love with. He has been close to her since birth. refuses to accept minyoung's feelings since they are 10 years apart and he feels like a e for liking her.

Yeo hoonmin: minyoung's step uncle. Hates her, since he thinks she is the cause of his wife finding out about his relationship with soohyun.

kim jinyoung: min young' evil step aunt.Blames her for the death of her precious sister.

Kim sungeun :minyoung's evil step cousin. Hates her. Loves to abuse her. Mentally and physcially.

shin dongho: the neighbor boy that likes to talk to minyoung, has a dark past , wants to start new.