Choo Sang-woo, a Computer Science major, is a stickler for principles and the embodiment of rule compliance. The encounter between two individuals, one with a mind for engineering and the other for the arts, whose personalities don’t overlap in the slightest, continues relentlessly – whether by coincidence or fate. And somehow, despite everything, they are creating a mobile game together?! The bright red semantic error, Jang Jae-young, shakes Sang-woo's perfect world! Will he be able to debug this error?
SangWoo studies in the library alone until JaeYoung joins him.
JaeYoung and SangWoo go out drinking and play Yaja Time.
JaeYoung flirts with SangWoo on the phone.
JaeYoung sends SangWoo on a treasure hunt.