The world of conquering demons merges with the world of alien space:
The story begins when Fang Rijin and Xing Kelan receive a video that Marry was killed by Chen Zhengchang in the future. Fang Rijin contacts the demon-conqueror Ma Ji to assist in the investigation, but is involved in a larger serial murder. The case not only involves a sad past, but also involves the common fate of Fang Rijin and Xing Kelan's past and present lives. Zhuang Dingqin and Tao Xiaobao have returned from resurrection. Are they enemies or friends? How should the demon-conqueror Ma Ji balance his love triangle with the water elves Bebeina and Zhuang Ziruo? Can Mo Weihao and Schlaith finally get married?
Purpose: Fang Rijin punishes Kelan to protect each other's future, save friends, and maintain peace.