Set in a fictional Republic-era China, wealthy heiress Duan Yixuan is rescued by the cold and imposing warlord Xu Mochen aboard a train, but her familiar eyes make him suspect that she is the female assassin who tried to kill him six months earlier. The memories she has lost conceal a secret, and his hardened heart gradually begins to soften under her influence. A mismatched marriage engagement, old family cases, and a series of conspiracies draw them closer as they cautiously fall in love, only to drift apart amid suspicion. When her family falls into decline and danger closes in, the pampered heiress learns to stand on her own, while the stern marshal finally confronts his true feelings. In a world torn by turmoil, they learn to protect each other.