How did Li Xiaoyao return to ten years ago in the legend of the Sword and the Chivalrous Man?

To save Linger.

The Legend of the Fairy Sword and the Chivalrous Man is a costume fairy fantasy TV series adapted from Daewoo Information's stand-alone game of the same name. It is jointly produced by Shanghai Tangren Film Production Co., Ltd., Yunnan TV Station and Shanghai Film and Television Co., Ltd., directed by Li Guoli, and co-starred by Hugh, Liu Yifei, Ann, Liu Pinyan and Eddie Peng Yuyan. The drama tells the love and hatred between Li Xiaoyao, the shopkeeper of the fishing village, Zhao Linger, the descendant of Nuwa, and Lin Yueru, the eldest lady of Linjiabao. Together, they wiped out the story of Yue Bai to save people. The play was broadcast on Taiwan Province Zhongshi on January 24th, 25, and then on Hebei Satellite TV on January 27th, 28.

Episode 28:

Outside of Linger's lock, Xiaoyao's medicine seems to be getting weaker and weaker, and he remembers all kinds of things he used to do with Linger in Xianling Island. Xiaoyao holds the locked Shine, and it hurts. Shine's soul is moved by Xiaoyao's true feelings, and returns to the body and is resurrected. Yueru sacrificed herself in order to fulfill her freedom and shine, and was buried in the lock demon tower. After waking up at large, I knew that the moon was dead, and I was sad. In order to save Shine, I went to Loi Wo Temple and got the unicorn horn, and was sent back by Nu Wa Empress ten years ago, the day when the Empress Wu was put on trial.