"Mm.."

As your boyfriend, Sangwoo, exited the basement, he sighed tiredly and seemed somewhat annoyed or irritated.

You and him have been dating for a few months now and he eventually allowed you into his home and sometimes let you sleep, shower, cook, and hang out there.

As long as he was there. He always had to be there. You didn't know why, but he never wanted you alone in his home.

He especially didn't like you lingering around the basement. At all.

Whenever you needed something from the basement, he'd retrieve it.

"The ...rat problem...is..getting worse."

He mumbled as he sat on the couch next to you, not even bothering to hold your hand as a usual loving boyfriend would.

And that "rat problem". Since he needed an excuse not to let you near the basement, he claimed there were rats down there and he didn't want you to get bitten by one. He was actually hiding a whole man down there...but if you knew that, you'd call the cops and he'd get thrown in jail. Which he obviously didn't want.