After his father is beaten to death, Zhang Jianguo becomes timid, fearful of confrontation, and overly honest. Although kind-hearted, he endures an incredibly difficult life. When he opens his eyes again, he has returned to fifty years earlier. In this lifetime, he is determined to change his personality: a gentleman never leaves a debt of vengeance unpaid! Meanwhile, while his family is digging a cellar, they uncover an underground cave containing an enormous supply of water and fish. With these resources, he not only leads his family to a better life but also takes revenge for his father. However, while pursuing his revenge, he discovers a conspiracy targeting his family and unexpectedly finds love. It turns out that changing one's personality really can change one's destiny!