Programmer Chen Yan wakes up in the parallel world of Shanghai in 1936. The history here is paradoxical, and the forces of all parties are intertwined. The kilometer-level alien space he carries with him has become his only way to survive in troubled times - the time inside and outside the space is synchronized, so he can enter and avoid danger at any time, and he can travel freely throughout Shanghai like any door.
He originally wanted to protect himself wisely, but due to an unexpected rescue, he was forced to be involved in the torrent of history. The military commander wanted him to be the sharpest knife, the central commander regarded him as a variable that needed to be controlled, the underground party tried to fight for this mysterious power, the Japanese secret service vowed to uncover this "ghost", and the Youth Gang tycoon wanted to use him for his own use.
In this battlefield without gunpowder, Chen Yan must use modern wisdom and caution to deal with all parties. He schemes, deceives, and betrays just to get home safely after completing his mission. But when his homeland falls and his compatriots suffer, this ordinary person who just wants to preserve himself has to think: should this unique power be used to escape, or...
