At an Air Force Academy strictly forbidding romance among cadets, fourth-year student Lim Cheong-ha enforces the rules with absolute authority. Her rigid world flips upside down when an unhinged fellow cadet confronts her with cryptic, tragic final words about a past life where he killed her. Sick of his intense obsession, dramatic soulmate ramblings, and lingering gazes, Cheong-ha demands he spit out a proper confession so she can promptly punish him for breaking the romance ban.