i can't remember the chapter, but he gave eungyeom the wrong files or something and passed the blame on to eungyeom and he got caught lying by jihyuk crazy_fujoshi
Ohoo thank you so much <3, So it was him, I thought it could be him but the dialogs confused me and that was soo long ago too jsjsjsj I search it and in case anyone is wondering it was around chapter 19-21
I really don't remember who is that substitute person, can somebody please remind me or tell me in what chapter does he appear