Sorry! The System is Awesome

By chance, the protagonist got a broken system.
It didn’t matter, though. A broken system turned out to be better!
By posting his own quests, whenever and however he wanted, the protagonist was heavily rewarded each time when a quest was completed.
“I’m going to catch 10 mice tonight.”
“Ding!
Quest posted.
Quest: The host will kill 10 mice in 24 hours: 0/10
Reward: The reward system is analyzing the difficulty of the quest. The rewards will be generated later.”