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Top actor Park Seha—His 'ultimate bias' has just crashed into his perfectly ordered life! Park Seha, the ultimate perfectionist and A-list actor. And Son Jieon, the dependable leader of a failed idol group. The two are cast side by side as leads in the queer film Brotherhood. Unlike their characters in the movie, who grow closer as they solve incidents together, the noisy, energetic Jieon and the quiet, by-the-book Seha seem like oil and water. However, there is one fatal secret that no one knows. Park Seha is actually Son Jieon's die-hard fan! Despite Seha's desire to keep his distance, Jieon barrels into his life like a bulldozer, clinging to him and begging, “Please teach me how to act!” And the next morning, Seha wakes up to find himself in the same bed as Jieon...

Method actor Park Seha and flop idol Sohn Ji-eon are cast as lovers in a queer crime film. What begins as open hostility born from clashing backgrounds slowly transforms through forced rehearsals and intimate method acting. As Ji-eon’s sincerity and relentless effort break down Seha’s defenses, professional boundaries blur into dangerous attraction. Determined to call their growing closeness a “mistake,” both men struggle to separate acting from reality. Caught between obsession and devotion, they must decide whether their connection is merely part of the role… or something real.