Kong Lingyi, the sole survivor of the massacre that wiped out the Kong family, assumes the identity of Su Wanqing and goes undercover in Haicheng to approach the prime suspect, Young Marshal Gu Yunshen. She proceeds cautiously, but he has already seen through her disguise. She investigates him, and he lets her do as she pleases. In the end, they discover that they are seeking the same truth. From enemies to allies, from fighting side by side to falling in love, they join forces to bring down Wei Jing, a corrupt cancer within the military, and clear the Kong family's name. When she uses her own body to shield him from a bullet, the end of her quest for revenge finally becomes the beginning of love.