Bai Ze transmigrates to Zenless Zone Zero, arriving in the early days of New Eridu.
With his remarkably high Ether resistance and extraordinary combat skills, he survives one crisis after another. But after narrowly escaping death, Bai Ze finally realizes that no one can survive alone in this brutal post-apocalyptic world. So he joins an organization. As he rises through its ranks, he discovers that the group he joined is actually the Reverent Society. He wants to turn back before it's too late, but the moment has already passed. The outside world calls him the Grim Reaper, while within the Reverent Society he has earned the terrifying codename Hades.
On the eve of the Reverent Society's imminent destruction, the organization assigns him a mission: find the source of the gods. Their destination is the moon. After he successfully lands there, the extraordinarily high Ether concentration finally activates his System, granting him the ability to transform into a Thiren and evolve by devouring other Thirens. As he celebrates, he accidentally falls into a bizarre Hollow and is sent across time and space.
When he wakes again, all he has left are his memories from before the transmigration. The first person he sees when he opens his eyes is Officer Zhu Yuan.
After Zhu Yuan discovers that he is a member of the Reverent Society, and with her mother's encouragement, the two get married. She hopes to learn about the hidden remnants of the Reverent Society.
As the Society's remaining forces test them time and again, Lin Mo gradually starts to remember. But he doesn't want his identity exposed, and he has no intention of returning to the Reverent Society, so he decides to make his fake marriage with Zhu Yuan real.
And so, these two with their own hidden agendas begin their Mr. and Mrs. Smith-style...
