Also known as Annihilation. A straightforward, loyal younger military officer seme × a cool, self-possessed older professor uke
Part One:
An experimental project to harness antimatter, codenamed "Transition," failed. The massive explosion it caused triggered an irreversible catastrophe.
Young scholar Xu Yuan unexpectedly learns that Zhou Wangqi, once his student, was one of the experiment's lead operators and was executed by the highest military court for disobeying orders.
Xu Yuan is filled with doubts, but an unseen force seems to be obstructing his investigation. Just one step away from the truth, a bullet whistles through his chest.
When he wakes again, a completely inverted new world lies before him. And there, too, is... Zhou Wangqi, alive?
Part Two:
A strange outsider has appeared at the Beishan experimental base. He is gravely injured, and both his identity and his origins are a mystery.
"Xu Yuan." Zhou Wangqi rolls the name around on his tongue. "It sounds familiar, but I can't remember where I've heard it."
His profound knowledge earns everyone's admiration. In this isolated, desolate restricted zone, the two of them seem to be gradually becoming each other's only support.
"Professor Xu." Zhou Wangqi blushes. "It's been a long time. You seem to always be looking at me."
Xu Yuan is taken aback. He hurriedly looks away. "Sorry. I just think you remind me of someone I once knew."
Zhou Wangqi asks carefully, "Can I ask who he was?"
Professor Xu looks up at the sky. "He sacrificed himself."
Commander Zhou wakes up in the middle of the night and has to sit up and slap himself: I really am the worst.
A reincarnation plot wearing a sci-fi disguise. I'm jealous of myself.
P.S. There is no romance while the seme and uke are in a teacher-student relationship.
Theme: A love of peace