I like her character (she's bold and seems to Care about the country) but... I don't like how she wants to take davantage of him. Especially after what he already did for her. She lacks gratefulness.
"We must prevent her from using her power because she can't control it" That the stupidest (and most ancient) mistake of all time. Making someone unable to practice is the best way to make them incapable. And hearing that from a TEACHER... ┑( ̄Д  ̄)┍
So if I get it well, the ML baited the MC with S/M plays to lure him into a Dom/Sub relationship without informing him without his clear consent without rules
He even say it himself ! That he "saved him" in order to make him submissive in the futur. What a shameless manipulative bastard.
We already know that but... it need to be said right now : Jin is BOLD ╮( ̄▽ ̄)╭