Mon Chamgesseoyo!
Gong Jin became horny all of the time just because he took the wrong herbal medicine. His unrequited love and childhood friend, Cha Seung-Hyuk, caught him doing it?! Unlike Gong Jin, who is worried that their relationship with Cha Seung-Hyuk will become awkward, Cha Seung-Hyuk keeps provoking Gong Jin as if he got a fun toy...
"Hyung, I can't stand it anymore..."
"What can't you stand?"
(Source: Mr.Blue, translated)