Because of his weak ability to learn,  the school jeonghan attend told him to sign a paper about quitting, they were too honest and direct without out caring about his feeling or how he hardly accepting the fact that he was born like this.  Since early age he stopped going to school and decided to help his father at their small restaurant that barely had customers.

After the shooting of going seventeen ep. 12 escape room #1. Jeonghan was having the trouble sleeping. The only way to make him sleep is to go inside the arms of his loved one.

Jeonghan was in doubt about S.Coups' feelings. What will happen to their relationship now? After S.Coups was rejected by Jeonghan.

Yoon Jeonghan meets Choi Seungcheol at his favorite internet cafe and they start believing that they're soulmates. That is, until it's time to choose what stays, and what has to go.

Choi Seungcheol: easily attractive, conventionally handsome, everyone's favorite... except for Yoon Jeonghan? Leave him alone, he's trying his best (in wooing unassuming, vague, oblivious Resident Assistant- who probably has hiccups in an emotional sense). Good luck, though.