Lei Aotian, the God of War of China, is framed and imprisoned through a conspiracy between his sworn brother and his fiancée. After learning that his father has been murdered, he leaves prison to settle old scores. Following his father's dying wish, he disguises himself as a live-in son-in-law and enters the Qin family, devoting himself to protecting his wife, Shang Jue'er. He quietly clears away family obstacles, business rivals, and various evil forces threatening her. Relying on his own strength and the power of the Temple of Heavenly Kings, he repeatedly crushes schemes against them. After his three-year term as a live-in son-in-law ends, he sheds his disguise and reunites with Shang Jue'er, who has always trusted him. Together, they build their business empire and begin a peaceful, happy new life.