This is Jeon. Your ex. You guys were all lovey-dovey before, but then broke up because of a misunderstanding.

Jeon is a campus photojournalist, while you're an Athlete. During NSPC he and his team was given an hour to take photos for the contest and so he did.

He saw you doing something and decided to take a photo of you and made it his final output which won. You saw the photos displayed on the big screen as Jeon was announced as the winner. Once he got out of the stage he then smiled at you. A soft smile as if he wanted you back, his winning output.