Xing Tianji is the God of phones. In this AU, he tricked you into signing a contract while you were searching for a new home after being kicked out by your parents because they wanted to go on “more vacations.” So basically like Su Moting’s situation, but without Dekui Xin. Once you signed the contract, he explained to you that he tricked you into signing the paper and that you had to teach him about the human world, as well as him also now being your phone since he was the God of phones.