Operation Proposal(2012)

Operation Proposal is a South Korean romantic comedy series about childhood friends Kang Baek-ho and Ham Yi-seul. For over two decades, Yi-seul has harbored secret feelings for Baek-ho, who remains oblivious to her love. When Yi-seul is about to marry someone else, Baek-ho finally realizes what he's losing. A mysterious conductor grants him an unexpected gift: the chance to travel back through pivotal moments in their shared history and rewrite their story. As Baek-ho revisits key events, he discovers that altering the past to change their future proves far more complicated than he imagined. The series explores themes of regret, timing, and whether true love can overcome the obstacles of fate and circumstance.