Xu Ying is a man with a mysterious identity, and everything about him is unpredictable. He is an immortal, but he will die like everyone else, the only difference is that he will be reincarnated with his memories. He didn't know the meaning of his existence or the value of his life. He just followed his instincts and lived day after day, year after year, numb and indifferent. He began to give up pursuing many valuable things in life, such as dreams, friendship, and love. He was only serious about one thing, which was to collect information about abnormal human beings around the world and conduct research. He lives only for himself. In this life, he finally found a special person as in his dream, and life became interesting.