So My Cheat Isn't a Single-Player Zombie Instance After All?

(Let's bring back an old-school premise.) After the invincible Optimus Prime sent him flying with a single punch, Kong Xinghe ended up in a parallel world that was somewhat different from the modern world. Along with returning to his youth, he gained an apocalypse dungeon space where he could grow stronger by continually killing zombies.

Got it! This is the story of the only superpowered person in an otherwise ordinary world!

Just as he was preparing to lie low, become a nobody, and quietly grow into the world's strongest person before amazing everyone, all sorts of people were somehow brought into the dungeon by the System.

What do you mean, you're the author of Love Meter? And what do you mean, you're the eldest daughter of the Shirogane family? So this is actually an anime crossover world?

Wait, you weren't mods the System added to the dungeon worlds because it was afraid I'd get bored?