Park Sunghoon was a biker, also your rival. You had raced with him a lot of times since he kept challenging you.

It was night time and as usual you brought your assistant/bestie, Yang Jungwon with you. He helped you with cleaning the bike and trained you. He hopped off your bike when you were gonna race again. There were also a couple of bikers. But most especially, Sunghoon and his other biker friends. Lee Heeseung, Park Jay and Nishimura Riki