Chansons. School.

Physics teacher Han Ji-sung always stood out from the other teachers at school with his nasty temper. He was despised by both students and some teachers, with whom he had a tense relationship. The same cannot be said for the principal, Bang Chan. He was a kind and welcoming man who treated all the school staff and students with care, making him a source of laughter.
Jisung had long had his eye on Christopher: a tall, muscular man with a smile, yet a feigned kindness. What's his secret? It was precisely because of this that the physics teacher had unwittingly fallen head over heels for his own principal.
Chan, a man not blind, noticed every fleeting glance Jisung gave him, which made his heart tingle pleasantly. But neither Chan nor Han dared admit it, as such a thing was not accepted in society, so all they could do was live, hiding their heartbreaking love deep within.

A knock sounded in the empty physics classroom, after which the door slowly opened, revealing a familiar face—Seo Changbin, the school's vice principal, who was no less important. "Han Jisung, I was asked to invite you to Bang Chan's. I don't know why, but his face was strangely serious. I don't like it," Changbin said seriously before closing the door and leaving, leaving Jisung perplexed.