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"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.
Chanwoo owns a coffee shop in Seoul. His little brother Jungmin is living with him while he looks for jobs. These two brothers share something in common. They both have the hots for one Sung Dayeon. She’s a childhood friend of theirs and now lives in Seoul as a model. Jungmin’s the one who got there first however, and is now dating Dayeon. Looks like Chanwoo has to just wonder what could have been… But Jungmin’s cheating ways end up bringing Dayeon into Chanwoo’s arms. And when Jungmin discovers the two together, things look like they’re about to get ugly. But…is this really happening? Is seeing his brother sleep with his girlfriend really turning him on?! Still, Jungmin can’t let his brother get away with this. Like the bitter taste of caffeine, these sexy thrills can be dangerous but addicting...
Beom-jun is a shy, introverted guy working at an all-girl’s high school as the literature teacher. Owing to his shy nature, he hardly interacts with other teachers, but the P.E. teacher, Yeonwoo, is not having it. When a series of happy accidents force them to share a room together at a training center, Yeonwoo sees it as the perfect opportunity to draw Beom-jun out of his shell and even his clothes… After all, what better way to get to know someone than getting physical?
"Sex, sex, sex... What's the big deal about sex?!" Gyuri, a native of Jeju island, is only interested in turning her cafe into a big brand. But her happy daily life is suddenly disrupted by a rude customer criticizing the taste of her coffee, calling it 'dishwater'. Certainly, this was her worst encounter with a stranger... until she saw him naked. In the end, Gyuri wasn't able to sleep and ended up masturbating for the first time...