Caffeine

Synopsis

"Hyung had sex with my girlfriend in front of me".... Jung-min accidentally witnesses the sex of his girlfriend, Da-Yeon, and his older brother, Chan-woo; and he feels the excitement of losing his lover for an unknown reason. It’s the first time he feels it. Jung-min wasn’t the only one who felt the thrill of being addicted to it.

Also known as 카페인