[Introduction] By chance, Liuying, a little girl in Xiahou's mansion, rescued a thousand-year-old Yinglong. Lord Dragon King is grateful for Liuying's life-saving grace, and wants to agree with him with his body, and in the name of Liuying, he will give it to Mantian Liuying as a token of love. However, the world is always changing. Xia Houxue, the daughter of Xiahou Mansion, died in Huangquan because of Yuchi Longyan's death on the way to find Liuying. Yan Wang gave Yuchi Longyan two choices, one is to exchange Liuying's extremely yin soul, and the other is to repay Xia Houxue III's kindness. Yuchi Longyan couldn't bear to hurt Liuying, so he finally chose the latter. In order to achieve the agreement with Hades, Yuchi Longyan can only bury his feelings for Liuying in his heart. However, while repaying his favor, he also silently guarded Liu Ying's reincarnation. In the first life, she was protected and married to the number one scholar. The two loved each other. In the second life, she was reborn as a fisherman's daughter, and suffered from poverty and bullying from others. Yuchi Longyan sent her to the palace with a plan of rain. He wanted to give her a lifetime of prosperity and wealth, but it was not enough for the emperor's coldness. In the third life, she became a heroine general. In order to help her beloved one fulfill her adoptive father's last wish, Yuchi Longyan was willing to guard her silently, resisting the rain of swords and arrows for her. In the fourth generation, Liuying was reincarnated in the sect of cultivating immortals, and was guarded by the Dragon King since he was a child. He thought that this time the lovers would finally get married, but unexpectedly, life was rough and the world was full of troubles. It is a beautiful love story, talking about instant and eternity, trust and protection.