Park Seo-bin

Ms. Maeng, a small-town teacher, unexpectedly joins the team responsible for creating South Korea’s most important exam: the College Scholastic Ability Test. She thought it would be all about academic prestige and scholarly debate but instead finds herself locked away under spy-level security, her phone confiscated and surrounded by office politics. Can this unlikely underdog turn test stress into test success, or just test everyone's patience?

Orphaned, Nam Yujin grows up with the three Nam brothers, with the promise that one of them will marry her on her coming-of-age. But upon the return of their true sister Nam Sua, Nam Yujin loses their love and sinks into desperation. Even when she marries her suitor Ha Jihoon, they deem her as attention-seeking and only regret after unveiling Nam Sua's true colors—but Nam Yujin is never coming back.