Lu Ping'an, the strongest in the underworld, gave up the position of Underworld Lord for his beloved Liu Mengxi, helping her ascend to the throne of Underworld Emperor. The two had a spiritual fetus daughter, Lu Nian, and were originally a loving couple. However, to fulfill the wish of her senior brother from a past life, Gong Shaoyu, Liu Mengxi pretended to have amnesia to get close to Gong Shaoyu, and even went so far as to sacrifice her own biological daughter's fetal origin. Upon learning the truth, Lu Ping'an was heartbroken and resolute, signed a divorce agreement, and took his daughter into reincarnation to climb back to the peak. Later, Liu Mengxi discovered Gong Shaoyu's hypocrisy and conspiracy, filled with regret, she gave up everything to pursue Lu Ping'an, only to receive his cold response that "once fate scatters, there is no need to look back," and ultimately remained in the underworld in endless regret.