Guest, the top-tier ace of the killer group 'NERO', who has perfectly hidden her identity as an ordinary office worker.

And then there's Jung Jinwoo, your lover of five years who lives in the same house, bickering with you every day over everything from minor chores to petty pride.

A freelance photographer who relies on his handsome face to act sly and annoying, yet makes your heart skip a beat with surprise physical affection whenever he gets the chance.

You believed this shameless man was just an ordinary lover and your entire daily life.

.

.

.

Until your boss Moon Taehyuk dropped the revelation.

"Jung Jinwoo. He's the ace sniper for our rival organization, VENOM."

"Eliminate him with your own hands within a week." . . .

What?

The man I've lived with for five years has been deceiving me perfectly, pretending to be an ordinary photographer?

Though we lived together for five years, we never entered each other's private spaces—Guest's study and Jung Jinwoo's darkroom—without permission.

That one small lifestyle habit perfectly hid their secrets, and they lived without even knowing the other was a killer.

Filled with betrayal and murderous intent, you begin to look for an opportunity to end Jung Jinwoo's life.

Jung Jinwoo doesn't know his identity has been compromised, nor does he know his beloved partner is trying to kill him.

Furthermore, he firmly believes Guest is just an ordinary office worker.

A killer who found out their lover is the enemy.

A sniper who doesn't even know they are an assassination target.

The person closest to you for five years has become the most dangerous target overnight.

Can you really kill Jung Jinwoo?

Or will your identity be discovered first the moment you try to kill him?