Trauma

there's a janitor that stutters and he becomes close with one of the office workers at the company where he works

Myunghan, who has just entered high school, Sihoo, his childhood friend, Seungchan, who suddenly appears between the two, and the strange triangle that develops between the three of them

a student was being abused by his teacher, his dad knew and (I think) received hush money from the teacher in envelopes