Gongpo Jjeukkureu Saengjongi

The moment Lee Hyeon launches the legendary horror game Unreal, he finds himself trapped inside it. Waking up in a school in the dead of night, he meets Da-Yeon, a mysterious high school girl. There is only one way to survive here: solve the chilling puzzles and uncover the hidden rules. Will the two of them be able to end this game of death and return to reality? (Source: Naver, translated)