After marrying into the Duke's residence, the heroine discovers that there is more to her marriage than meets the eye. Faced with cold treatment and schemes, she refuses to suffer in silence and decisively fights for justice. By a twist of fate, she rescues the seriously wounded and unconscious General Who Guards the Nation. Everyone believes he has little time left to live, but she refuses to let a loyal and honorable hero be forgotten. She stays to care for him and helps him investigate an old case. As they spend time together, they go from testing each other to placing their trust in one another. The general gradually recovers, while the heroine uses her wisdom to secure her place. In the end, they join forces to expose the conspiracy and find true love.