Lin Mange, a righteous and smart medical student, sneaks into the Lu family to avenge her friend Lanlan's bizarre and tragic death, and becomes the eldest son's fiancée. However, she is discovered by the fox-like second son Lu Haoran, and is abused and killed in a series of counterattacks. As she gets along with Lu Haoran, she is attracted by his sincerity and justice under his disguise. The two go from suspicion to trust to love, and finally find justice and the truth.