To uncover the truth behind his parents' murder, Lu Chen conceals his identity as the head of Yulong Capital and lies low for three years as the Su family's live-in son-in-law, becoming a useless man who lives off his wife's family in everyone's eyes. When the marriage contract expires, his rival Gu Hongtu closes in and repeatedly plots to frame the Su family. While secretly making plans and gathering evidence of crimes, Lu Chen protects Su Wanqing and his adopted daughter, Su Tangtang. Over time, Su Wanqing's initial contempt and suspicion toward Lu Chen gradually turn into affection and trust. Lu Chen defeats Gu Hongtu and uncovers the truth behind the murder from years ago, avenging his family, but then receives a mysterious email revealing that the real mastermind is still at large. He must stand alongside his family to face a new crisis.