Over and Over

Wu-jin and Jae-hyeong first meet in a college elective course, where they are paired together for a group project. Despite working together throughout the semester, their personalities clash, leading to a strained relationship. On the last day of the semester, the group decides to have dinner together, and for the first time, Wu-jin and Jae-hyeong end up drinking together.
The next morning, Jae-hyeong wakes up with a hazy memory of the previous night and is shocked to find himself in bed, undressed, next to a sleeping Wu-jin. In a panic, he hurriedly leaves the room, reassuring himself that he’ll never have to see Wu-jin again.
A few hours later, Jae-hyeong is startled to encounter Wu-jin again in a snowboarding class they've both enrolled in, setting the stage for more unexpected interactions.

(Source: Lezhin US)