To Earn Your Trust

To Earn Your Trust manga summary: Nanxing xuan, upon reaching adulthood, is tasked by his father, the king of Neptune to bring back a treasured spar that has been lost for 100 years. He now has to retrieve it from college student Nan Kaifeng,but first, he has to gain his trust. The problem is, that the only things he know about human interaction is from a book borrowed from his sister called "Indulgence,Beauty and Seduction".