The little fox demon Ruan Su decided to go to the mortal world to experience calamity in order to quickly become an immortal. The second young lady Ruan Su, who was reincarnated into the Ruan Mansion, has a very good relationship with her sister Ruan Qing. When she reached the age of fifteen or sixteen, her sister Ruan Qing was controlled by the Sophora japonica tree spirit and robbed Ruan Su of his luck to become an immortal in order to replenish her childhood losses. But her sister Ruan Qing loves her sister Ruan Su very much in her heart, so every time Ruan Su's life is at stake, Ruan Qing can wake up and protect her sister. Ruan Qing finally pushed her sister away when Ruan Su was about to have her essence and blood sucked away, and she died as her essence and blood was sucked away. In order to avenge his sister, Ruan Su went to find the Sophora japonica tree spirit alone, but it was useless to fight with a mortal body. After Ruan Su's death, his soul returned to his true body, and his true body descended to eliminate the Sophora japonica tree spirit. He successfully survived the calamity, was promoted to Fox Fairy, and became the patron saint of a party.