Caffeine

Chan-Woo runs a quiet coffee shop in Seoul, sharing his living space with his younger brother, Jung-Min, who is currently navigating the job market. Beneath the surface of their everyday lives lies a complicated shared history: both brothers harbor deep romantic feelings for Da-Yeon Sung, their former childhood friend who now works as a model in the city. Jung-Min ultimately secured the relationship first, leaving Chan-Woo to quietly suppress his lingering affections and accept what might have been. However, the fragile dynamic shatters when Jung-Min's infidelity drives Da-Yeon directly into Chan-Woo's arms. The situation escalates dramatically when Jung-Min discovers the two together, setting the stage for a bitter confrontation. Yet an unexpected psychological twist complicates matters further, as the illicit encounter awakens unusual desires in Jung-Min himself, turning the betrayal into a source of forbidden arousal. Caught in a volatile triangle of loyalty, lust, and betrayal, the brothers find themselves consumed by a dangerous yet intoxicating temptation, much like the bitter and addictive taste of caffeine.