My Master Is a Steel-Brained Straight Girl

A cold, poker-faced protagonist who only pretends to be emotionless: Yuan Konglin

A wage earner who travels between worlds to repair breaches in the dimensional barrier.

(Worlds visited so far: Arknights, Sword Art Online, Dragon Ball, JoJo's Bizarre Adventure: Stardust Crusaders. Next world undecided.)

A slow burn with updates at a snail's pace. Just so you know.