"Esper, I told you I'm an ordinary B0-class guide." Lee Yeon, the highest-ranking dual blood system power, is working in the province, hiding his handsome face and outstanding talent. Meanwhile, he was assigned to the capital for some reason, and he was involved with Tae Ha-Jin, an S+ class esper, and had an implicit fight with him. Tae Ha-Jin, who is suspicious of Lee Yeon, knows that he is hiding something and begins to break it down by whatever means he can to reveal the hidden truth. Lee Yeon resists a man who tries to expose him, but it's not as easy for his heart, so he decides to use Tae Ha-jin as a shield for his safety, and works as Tae Ha-jin's exclusive guide...