Kom is an experienced bodyguard who is responsible for protecting a wealthy businessman with a very noble status. However, in an accidental assassination, the rich businessman was shot and died. Kom fell into a deep remorse for this, and although the rich merchant's wife understood that Com was not dereliction of duty but that the tragic outcome was inevitable, the rich merchant's son was still unwilling to forgive him and fired him. After that, the energetic young man became the next target of the enemy's assassination. fortunately, he avoided the killer's powerful fire and stayed anonymous in the slum, saving his energy to avenge his dead family. In the process, Combe is also unremittingly looking for the trace of the young master, and finally the two of them break the ice and begin to work together to find the real culprit.