After betrayal drives Huanhua Valley into exile, its heiress Fang Muwan rebuilds her life—only to be drawn back into turmoil when an assassination case exposes the masked leader of Wufeng Pavilion as her former husband, Xie Ciyuan. As tyranny tightens its grip on the realm, old love and deep grudges resurface, forcing her to choose between the fate of a nation and the heart she once tried to forget.

During the Lantern Festival, a strange murder suddenly occurs. Di Renjie stakes his life and steps into the mysterious situation alone. He clears away the thick fog, traces the murderer, and every step is full of suspense.