The Cuckoo is Innocent

A man who seemed born for the uniform through and through: Ji Gyu-hwa. Aka the Jaguar.
Assigned to his team—notorious for its icy, taciturn silence—the rookie recruit, Seon Na-won, is deployed on a classified mission to take custody of a certain scientist.

Only, the target turns out to be an eccentric researcher obsessed with time travel. In a desperate bid to save him, Na-won is dragged headlong into a time slip.

When he opens his eyes, he realizes he has landed in South Korea—sixteen years in the past.
Remembering the cardinal rule of time slips—never run into your past self—he flees as far as his legs can carry him. But there, of all places, he runs straight into a familiar face.

“Get up, Ji Gyu-hwa.”

The person before him is none other than his commanding officer, Ji Gyu-hwa.
Worse, it is his superior from sixteen years ago: a young, helpless child in the middle of taking a brutal beating.

Don’t mess with the timeline.
Whatever you do, do not touch the timeline.
.
.
.
I fucked with it big time.

“You’re in deep trouble now. You just got sold off. From now on, you have to do the laundry, clean the house, and cook all the meals at my place.”

This child was still human, not yet hardened into the Jaguar.
A boy who had yet to know blood, pain, anguish, or ruthless discipline—or the simple happiness that should have been his by right.

So wouldn’t it be all right to look after him, just a little, until I find my way back to the present?
Just until I go back. Just a little.