Double Identity: On the surface, physics professor Ke Yuan is an ordinary scholar. In reality, he is a core member of the secret "Gate Project," which researches parallel worlds. Hidden in his laboratory is a quantum device capable of opening a passage to another world.
- Unexpected Discovery: During a routine experiment, Ke Yuan unexpectedly receives a distress signal from "Ke Yuan" in a parallel world and discovers that his counterpart there is facing an apocalyptic crisis.
- Mirror World: Ke Yuan transmigrates to parallel world Alpha-7, where technology is more advanced but society is more oppressive. Most shocking of all, the "Ke Yuan" of this world has already died, leaving behind his wife, Lin Xia, and their daughter, Xiao Xing.
- Emotional Entanglements: Forced to play the role of his counterpart, Ke Yuan develops genuine feelings for Lin Xia as they spend their days together. At the same time, he works with this world's Gate Project team to find a way to save both worlds.
- The Truth About Doomsday: They discover that the two worlds are eroding each other at the quantum level. To stop their collapse, all passages must be closed, and the only way is for someone to remain in one forever and maintain the balance.
