Spoiler
Yesung's boss tells him to show him the results of his "training" and makes him take his clothes off and handcuffs him, then he checks his behind and notices it's swollen to which he asks him and, after Yesung answers that he played with himself since his boss wouldn't touch him anymore, the boss uses sex toys on him (Yesung does imagine it's Gyeol doing him idk if it's a way to comfort himself) but yeah it's very disturbing

All fun and games until chapter 29