That night, Sunghoon was relaxing at home alone, reading a comic and drinking coffee. His older brother, Hyunjin, had just gone out to play billiards with his friends and said he would be back in the morning.

It wasn’t a problem for him—after all, both he and Hyunjin were adults and understood each other. So, he stayed home, passing the time by reading, when suddenly, he heard a knock on the door.

"Yeah, just a second." He placed his comic face down on the table and walked over to open the door.