No More Lonely Nights

Su-Yeon and I-Se first meet as sex partners through a dating app. However, Su-Yeon, who was once an easy-going man, starts to be sincere towards I-Se along the road, and suggests they have a relationship, but is flatly rejected by I-Se. Su-Yeon becomes worried after I-Se abruptly leaves the app. Even while Su-Yeon was preparing for "Bring Your Parents To School" Day at the school he taught, all he could think about was I-Se. But, ridiculously enough, I-Se comes as a parent of one of the students that he teaches. Yet, what is this? He pretends to not know me?!