Sun Hang transmigrates into a world and finds himself in a hospital. In order to repay the medical bill, he has to sign a contract with the government, helping the officials to deal with the mysterious creatures which haunt them for a long time.

"I've got an idea."
"What idea? Just say it."
"If you're worried about 0398 disappearing inexplicably, why not handcuff her to someone?"
"That's a good idea, then cuff you to her."