I Went Undercover, but Became the CEO's Sweetheart

Yu Sui is a merfolk who, after arriving in the human world, seeks out his distant cousin. He thinks he'll enjoy a happy life among humans, but then his cousin tells him, "Someone stole something of mine." Yu Sui asks, "Who?" His cousin shows him a photograph of an impossibly handsome man. "It's him. Will you help me?" Yu Sui replies, "I will!" And so he's sent to get close to the man. Instead, the man becomes his long-term meal ticket. - Lu Xicheng, the high-ranking CEO of Beian City's commercial empire, is peerlessly handsome. Countless people flock to him, and beautiful women of every kind vie for his attention, yet no one can get close. Rumor has it that Lu Xicheng has a cherished first love in his heart. One day, someone snaps a photo of Lu Xicheng on a date with a mysterious lover, and everyone is stunned. The CEO likes men. Lu Xicheng: "..." He glances at Yu Sui, the little spy who is busy eating, and wonders when he'll be able to tell him that this isn't how you spy on someone. A scheming, hypocritical CEO x an innocent, carefree merfolk (Entirely fictional setting)