Caffeine

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...

(Source: Lezhin Entertainment)