Season 1

Small and introverted Gang Yoo has become known as the "thug hunter" after a few successful fights in the night streets.

Gang Yoo meets "the street's charisma" Jun Sangho again. He begins to understands the way of the street as he get into fights and learn new skills.

Kang Yu wants revenge because his friends were attacked, but he is consumed by his rage and doesn't know when or how to stop fighting.

Gang Yu helps Sang Ho in a fight, and after winning, the talk between the two finally makes Gang Yu realize that he's not walking on the right track.