Who's jae hee ?

Cheol's 1st stalker, the one he never knew about (the 2nd is Minyoung himself).
Somehow Minyoung decided to make use of him and delegated Cheol's day to day tracking to him while he was building his position.
We had enough flash-back, but i freakingly which to see this insane conversation they must have had tonreach this agreement