Nakamura Yuta has been hired to protect the heir of the Cultureon Group - Lee Taeyong as the Lee family goes on a luxury cruise. A prodigy at 14, Yuta is confident that he can earn his trust, keep him safe, while keeping his  own identity a secret. But as it turns out, Taeyong is brighter and more beautiful than Yuta could have ever imagined. And as Yuta and Taeyong's relationship grows, Yuta finds it harder and harder to separate his job from his emotions.