Jamie confesses to the cute and charming Park Jimin having fallen for him when she was his vocal tutor. He rejects her having no feeling for her at all, but then she gets herself a boyfriend. 

Oh Sehun was her fake boyfriend that had been in a previous relationship with a girl that cheated on him. Looking for comfort, he went to Jimin which was a big mistake. He didn't know that Jamie had already had many admirers.