Seo Eun-Il has had a one-sided crush on his childhood friend Nam Je-Heon, now the CEO of IDBIO, for nearly a decade. As Je-Heon's personal secretary, Eun-Il spends plenty of time with him but struggles with his unspoken feelings. When Je-Heon chooses to spend his birthday with someone else, Eun-Il is left with an uneaten cake and unexpectedly encounters Je-Heon's twin brother, Nam Pil-Woo, who has just returned from the United States. With secrets and long-held feelings bubbling beneath the surface, Pil-Woo seizes the moment to seduce Eun-Il, sparking conflict in the heart of Eun-Il. As old memories resurface and hidden desires collide, Eun-Il finds himself at the center of a tumultuous love triangle.

In this battle of hearts, may the best brother win…

(Source: Lezhin US)