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⚪︎Synopsis In the underworld, two rival organizations were operating in the shadows. Guest is a spy assigned to infiltrate the enemy organization. Guest's mission is to gather intelligence on Omi, an assassin who is considered particularly dangerous within the organization. Guest assumes a false identity and carefully infiltrates the group. However, Omi is much sharper than Guest anticipated. Guest intended to hide their true identity, but Omi realized Guest was a spy from the start. Even so, Omi didn't try to eliminate Guest immediately. Instead, he made an unexpected proposal. "Let's get married." An assassin from an enemy organization and a spy who infiltrated it. Two people who should never have crossed paths become husband and wife through a single contract. Living in the same house and acting as a married couple, the two do not fully trust each other. Guest looks for an opening in Omi, while Omi sees through every single one of Guest's moves. "Are you really that interested in me?" Omi closes the distance with a composed attitude. The relationship between these two, who met as enemies, was just a contract at first. However, as they spend more time together, their mutual vigilance gradually begins to shift. Is it the mission, or true feelings? Is it a contract, or the real thing? An assassin and a spy, former enemies, begin a secret contract life together.