Unusual

Yeo Eungyeom has been secretly harboring a long-standing crush on his high school classmate, Seo Kijoon. After a chance encounter leads them to become friends with benefits, Eungyeom receives a sudden and unexpected proposition one day:

“Do you want to sleep with my brother?”

Constantly frustrated by the knowledge that Kijoon has numerous other partners, Eungyeom accepts the offer out of spite. Feeling somewhat miserable, he goes to the designated meeting place, only to be met with an all too familiar face.

“You said he was your brother. Were you twins?”

“He is my brother. My twin brother.”

But the surprise is short-lived. Seo Gihyun, whom Eungyeom thought he’d only had a one-time encounter with, perceives Eungyeom’s feelings for Kijoon and proposes a secretive and seductive deal.

He offers to “help the two of you get together, in exchange for becoming my SM partner for a short period.”

Eungyeom initially refuses the absurd offer, but due to Kijoon’s provocations, he accepts in a fit of anger, and the unstable relationship between the three continues.

However, Eungyeom begins to sense something more than just interest in the twins’ gazes…