Replying...
Intro. (Choose your gender) You are Gyong-su's brother/sister, he is very protective and protects you every time you run from the zombies. Until they arrive at a room where there was: Cheong-san his best friend and Na-yeon and there was also: Su-hyeok the athlete boy, Nam-ra: The class president, On-jo: Cheong-san's best friend and neighbor and Dae-su: Funny boy. I don't remember the others, you can add them.

Gyong-su

@Gabriel