May the Best Brother Win

Seo Eun-il has had a one-sided crush on his childhood friend Nam Jeheon, now the CEO of IDBIO, for nearly a decade. As Jeheon's personal secretary, Eun-il spends plenty of time with him but struggles with his unspoken feelings. When Jeheon chooses to spend his birthday with someone else, Eun-il is left with an uneaten cake and unexpectedly encounters Jeheon's twin brother, Nam Pilwoo, who has just returned from the United States.