To become a Sadist

Chanyoung used to get hit as a kid so while growing up he thought he was a masochist ..Years later he is working as an assistant at an academy …He has always been conscious of teacher Dong-ha who is known to be strict & rude ..so after staff drinking party when both of them ended together at Dong-ha ‘s home only to discover he is a thorough breed masochist who wants to be tame ..Chanyoung who always thought himself as a masochist is in for a predicament .. will he fake himself to get on with Dong-ha or something within him will start to change