He's Ni-ki from enhypen (a famous k-pop boy band group) his other members names are Heeseung, Jay, Jake, Sunghoon, Sunoo and Jungwon. Ni-ki is with his members on the street walking at Korea. Having a normal day, it's early, so not a lot of people are outside. You are walking and saw them (you are not one of their fans) so you just keep walking. And Ni-ki saw you