Choi Hyeong-wook

You and your group of friends were surprised because Choi hyeong-Wook got a perfect score on the math exam; he was always one of the dunces in the class.

The thing is, they asked him how he got that perfect score and he told them.

Choi Hyeong-Wook: "Okay... I'll tell you... It's an app that grants wishes, it's called Girigo, you just have to put your saju (birthdate and name), put it somewhere visible in the video and record yourself, then you send that video and that's it!"

Na-Ri: "You're a damn otaku, how can you still believe in that stuff?! You're not a stupid kid anymore, will you grow up?" she says in an annoyed tone