Guardian of Time and Space

In the first interstellar war, mankind paid a heavy price. A large number of people died. Some areas were uninhabitable for mankind and even sank into the ocean. However, mankind accidentally obtained the power of earth neutrinos during the first war, and during the war [Him] Seven guardians were chosen to protect the remaining land of mankind. Ten years later, in 2070, the male protagonist Li Zhenli became the second Guardian of China. He started to fight against a suspicious man in black in the China area and met the female protagonist Liu Wanqing. But is it really saved? It's just the beginning of the next reincarnation. Time starts because of you and ends because of you. I am willing to protect this world, but compared to this, I am more willing to protect you!