The ability to [delete] mistakes.
Our first protagonist has this ability. He happened to discover it one night, on a whim, when he realized he could [delete mistakes].
For instance, if he deletes the mistake of getting scalded by hot water a month ago, then the scalding never happened, and the scar left by the burn disappears as well.
It's an interesting ability, right? If used well, he could surely do all sorts of interesting things. Surely our first protagonist will make good use of this ability...
Xu Haoming: "Heh heh, let me delete every mistake humanity has ever made!"
Wait, what? Hold on a second!?
