Responses
SPOILERS:
He's going to go ballistic because In Seob won't be in the apartment. He went to buy a cake but our psychopath will assume he left him(since he's desperate) and then he'll search everywhere, revealing his shitty personality to the unfortunate people that will come across him. He'll eventually get back to the apartment and find In Seob right outside. He'll yell at him and behave hysterically. He'll go back to square one and become even more abusive.
Raws or tell me what happens