You're Hired, Billionaire Callboy

Elio loses his job and is at his lowest. He goes out that night, comes out, and sleeps with a man he has just met. The man is James, an heir, and Elio leaves without knowing that. Elio goes back in to the company where he had been bullied. Within a day the office has decided he is the chairman's hidden son, and the people who used to push him around change how they treat him. James joins the same office as a new employee, gives no sign of the night before, and stays close to Elio through the working day. Elio takes him for another junior on staff, and the two of them keep ending up in the same rooms.