Yan Mo, a female star living in the future world, unexpectedly developed a rare blood disease. The only person who could save her was Gu Yanzhi, a talented scientist living in modern times. In order to get Gu Yanzhi's blood, Yan Mo traveled to modern times and tried every means to approach Gu Yanzhi, only to find that to obtain qualified blood, an emotional factor must be produced in Gu Yanzhi's body. However, in the process of "instructing" Gu Yanzhi to love, Yan Mo and Gu Yanzhi were attracted to each other, which changed their fate and triggered the butterfly effect. Thus, their lives were about to come to an end. Gu Yanzhi and Yan Mo tried to retrieve the situation, but when they started over, what choice would they make between love and life?