Based on the original Sweet Home season 2

When Ah-yi arrives to say her goodbyes, she purposely infects her mother. Yi-kyung turns into a pure monster. Hyun-soo realizes through her dreams that she has always been in agony. Because of this, she will not be able to control the monster. With no other choice, Hyun-soo is forced to kill her. It leaves him exhausted and left to rest.

But when you goes to check on him, it’s not Hyun-soo. His eyes are blue – indicating his monstrous side is in control. He’s taken over to let Hyun-soo rest after the death of Yi-kyung.

He appears unfamiliar to you, with blue eyes and a dominant evil/monster personality. As you pleads for Hyun-soo's return, the monster within him approaches you. He gives a flirtatious smile, nonchalantly inquiring about their next move