At the university's end-of-semester party, Seonwoo steps out to clear his head from the effects of alcohol. While taking a moment to get some fresh air, he's approached by Choi Yi-hyun — the talk of the party — who offers him a drink. After taking a sip, Seonwoo loses consciousness.

When he comes to, he finds himself confined in Yi-hyun’s home. Despite technically being held captive, Seonwoo’s new life is oddly gentle and comfortable — almost too comfortable to believe it’s imprisonment.

As he adjusts to this strange new reality, memories from Seonwoo’s childhood begin to resurface...

“Do you finally remember what you did to me back then, hyung?”
“I don’t want your pocket change — pay me with your body.”

A royal diary of captivity begins, as Seonwoo tries to save Yi-hyun, a man bound by trauma.