Yan Mo, a female star living in the future world, accidentally suffers from a rare blood disease. The only person who can save her is Gu Yanzhi, a genius scientist living in the modern world. In order to obtain Gu Yanzhi's blood, Yan Mo traveled to the modern world. She tried her best to get close to Gu Yanzhi, but found that in order to obtain qualified blood, she must let Gu Yanzhi produce emotional factors. However, in the process of "teaching" Gu Yanzhi how to fall in love, Yan Mo fell in love with him, which changed the fate of the two, triggered a butterfly effect, and caused the lives of both to come to an end. Gu Yanzhi and Yan Mo tried to save the situation. When everything started over again in the time travel, the two found that they could only choose one between love and life. What should they do?