Report! There's a Vanity-Obsessed Test Subject Here

Two male leads. If that's not your thing, steer clear!!! One-on-one romance, both chaste.

Mu Yichen (a loyal attack-dog who was illegally modified as an experimental subject) x Yu Qing (a gentle researcher working in human genetic maintenance)

After a nuclear war destroyed the world, the survivors built cities, and experimental subjects and mutated beasts became new threats. Mu Yichen escaped from a modification facility and was rescued. By chance, he met Yu Qing, a researcher working in human genetic maintenance, who came to his aid. The two fell in love as they spent time together and grew closer, bringing a little genuine affection to a world full of bloodshed and violence.

A little scene:

Yu Qing: “Just breathe.”

Mu Yichen: (sucks in a sharp breath) “In the desolate land of Bashan and Chushui, my pretty wife is seducing me.”

Yu Qing: (exhausted, lies flat)

Mu Yichen: “Wifey missed me. Come here and cuddle.”