Can you feel it from behind?

Seojun, a college student, is popular with men. But, the problem is... He's not popular with women. He tries to get closer to the girls at the opening general meeting, but they are focused on someone else, yunwoo, a schoolmate of his. Envious of Yunwoo, Seojun gets wasted. And when he opens his eyes, Yunwoo appears unusually softer. He gets a strange sensation in his a**..."Seojun Hyung, can you feel it?""Why is this guy behind me?!"