Top star Park Se-ha — and suddenly, his “ultimate bias” barged into his perfectly controlled life?! Park Se-ha is the epitome of perfectionism, a top actor with an immaculate daily routine. Meanwhile, Son Ji-eon is the reliable leader of a failed idol group. The two of them are cast as the leads in the queer film Brotherhood, standing side by side as co-stars. But unlike their characters—who gradually grow closer as they solve cases together—Ji-eon is loud and energetic, while Se-ha is quiet and rigid, a strict rule-follower. They seem like complete opposites, like water and oil. However, there’s one deadly secret no one knows— Park Se-ha is actually a hardcore fan of Son Ji-eon. Despite Se-ha’s attempts to keep his distance, Ji-eon charges toward him like a bulldozer, clinging to him and begging, “Teach me how to act.” And then, the next morning… Se-ha wakes up to find himself in the same bed as Ji-eon.