In the first episode of Descendants of the Sun, Kim Gi Bum (played by Kim Min Suk) is a youngster who tries to leave his gang. He was caught and hurt in a robbery attempt. His gang found out where he was receiving treatment and went to the hospital to beat him up for not paying his dues on time. Dae Young (Jin Goo) and Yoo Si Jin (Song Joong Ki) walks in the middle of the beating and takes on the gang members.
Surprisingly, the gang members are not stylized in the normal dark garb that is associated with gangs. Instead, the gang members are wearing bright colored floral patterns. Flower power is real.
See the look: