"I don't think just once will be enough." "Hey, mmm..."
National swimmer, Moon Tae-gyeom.
He has a secret behind his spectacular comeback after a long slump. The reason he finally broke his stagnant record is none other than his friend of 20 years, Yoo Seo-hae.
Every time he sleeps with Seo-hae, his performance improves like magic.
At first, it was just for the records. But soon, he starts to get annoyed by every single guy around her.
"Yoo Seo-hae's body belongs to me, but there are too many bastards trying to covet it."
...Are we really just friends?
