Main Characters:

• SeulYong
• Luhan
• D.o
• Kris

SeulYong

19. D.o's younger sister in college. She hates Luhan and Kris really much, they're like her enemies. They both treat her badly, always teases and bullies her, but her brother just loves to watch her sister being teased. 

Luhan

20. D.o's best friend and also Kris's enemy. He hates Kris really much because he always gets to attract the girls in the college. Although he is D.o's best friend, he also hates SeulYong very much, starting from middle school. They bullied each other during the old days, but now, it's the same.

D.o

20. Luhan's 'brother', and also Kris's enemy too. He loves her sister so much but why wouldn't he care when Luhan bullies her? Even worser, why wouldn't he be mad if his enemy, Kris bullies her? He just laughs at his sister when she gets bullied or teased, his sister has a lot of aegyos. 

Kris

20. The tall and charming boy that attracts every single girl in the college except for SeulYong. He hates D.o so much that he also hates his sister, he also hates Luhan with no reasons. Loves to bully SeulYong until she cries, he still attracts a lot of girls even though he's the bully.