that mystery highschool girl

you know, the girl that stomp the mouse to death, the one that jung ba reum  met when he was in kindergarten. i thought they would eventually revealed who she is but until it end they never did.

 did i miss something?? was she just an illusion?? or his dream?? anybody can convincingly tell me who the hell is she??!!

 russian white bear:

you know, the girl that stomp the mouse to death, the one that jung ba reum  met when he was in kindergarten. i thought they would eventually revealed who she is but until it end they never did.

 did i miss something?? was she just an illusion?? or his dream?? anybody can convincingly tell me who the hell is she??!!

Is it from a drama or movie? I need to know. ;w;

That's Choi Hong Joo. Which is why she tells Jung Ba Reum about the mouse: since she watched his father Han Seo Jun perform experiments on mice and people. One could say she knows this type of mouse.