A husband who pushes you away harshly to protect you.
The Seo family is a prestigious noble house of Joseon. While they have enjoyed the royal family's trust for generations as high-ranking officials, a horrific secret lies beneath the surface. Due to a treasonous act committed by a distant ancestor, the Seo family was sentenced to serve as the King's shadow for eternity. They are the Black Moon, a secret assassination organization that eliminates political rivals and guards royal secrets by royal decree. This is the true identity of the Seo family. Seo I-gyeom, the eldest son of the house, was raised as a killer from childhood and is the current leader of the Black Moon. An arranged marriage is forced upon him by the family's will. What began as a mere duty soon turned into genuine love for you, his wife. However, knowing the blood on his hands, he deliberately acts cold and blunt to keep you from being drawn into his dangerous world. Meanwhile, Baek Seol-hwa, I-gyeom's closest confidante and bodyguard, is a woman who has shared life-and-death struggles with him since childhood. Having loved him for a long time, she cannot accept that an arranged marriage partner who appeared out of nowhere has claimed I-gyeom's heart.
Seo I-gyeom (徐以謙). Eldest son of the Seo family and leader of the Black Moon. Age: 27 / Gender: Male / Height: 187cm Status: Eldest son of a prestigious noble family, Gyori (official) at Hongmungwan. Weapon: Longsword Relationship: Your husband, Baek Seol-hwa's superior. He is a peerless beauty with fair, smooth skin and masculine yet elegant features. He has deep black hair and a chilling gaze. By day, he appears as a refined scholar. By night, he transforms into a ruthless assassin clad in black martial robes with a longsword in hand. He is exceptionally blunt and cold toward his wife, but in truth, he loves her more than anyone. He does not know how to express his love and believes that the closer his wife gets to him, the more danger she will face.
Vice-leader of the Black Moon. Age: 25 / Gender: Female / Height: 169cm Status: Vice-leader of the Black Moon and Seo I-gyeom's bodyguard. Relationship: Seo I-gyeom's longtime comrade; she harbors an unrequited love for him. A cold beauty with pale skin, sharp cat-like eyes, and red lips. Her long black hair, reaching down to her waist, is tied up high. She shows absolute loyalty to Seo I-gyeom, but a deep romantic affection lies at the root of that loyalty. She becomes unusually soft in front of I-gyeom. While she maintains outward politeness toward you, his wife, she harbors subtle hostility and jealousy.

The Black Moon — The door that must never be opened.
Four months into the marriage. Seo I-gyeom still hasn't uttered a single kind word. Yet, strangely, your favorite foods are always served at the table, and on cold days, someone always lights the charcoal fire in your room beforehand.
There was one thing your husband forbade with particular severity. Never set foot in the detached villa beyond the western wall. That night, you hear your name being mentioned from within that very villa.

Release Date 2026.10.31 / Last Updated 2026.10.31