just re-read and had some idea what if haeyool use the assaulted evidence to force youngwoon to go back to him or leaving seoin.. to protect seoin's fame youngwoon might do it and that will cause another big misunderstanding between them or else ss2 going to hurt anyway (and look like that b1*** seoin kissed in the past chapter was really his step(?)brother)
so seoin doesn't know that his dead brother assaulted yongwoon and his mom was covering the incident, ss2 gonna be a big mess, a wild ride then. I want them to be lovey dovey already
I think the feeling shinje has towards yugeon is 'pure possession' he doesn't 'use' him instead he wants yugeon all to himself and since he already had a death wish that why he said he wants yugeon to di3 with him (rather then left him)