Part 01.

Niall Horan was a successful businessman and also happily married to a woman named Barbara Palvin, he thought his life couldn't go anything wrong. Oh, how wrong was he...
Harry Styles was just a normal college student, he lives in a flat with his long-term best friend, Louis Tomlinson.But when he started to go on dates with his teacher, who was also married in her private life and kept it as a secret, well Harry ever find out?

Or, the one where Niall and Harry accidentally fall in love with the same person without them knowing.