After M died, K seemed to have disappeared as well, but Liu Chen didn't believe he had really gone. Just like the Dragon Group, M Group was a well-trained organization, and it wasn't easy for them to cultivate an assassin. They certainly wouldn't just execute him casually.
Liu Chen thought that K must be in hiding, possibly off to carry out even more covert missions.
Among the shadow assassins, M and K were almost as one. Now with only K remaining, Liu Chen felt this man wouldn't just let things go. He would surely use his connections and investigative skills within the M Group to find out the cause of M's death.
During that time, Liu Chen was quite nervous. Shadow assassins, as the name implied, were like shadows, omnipresent and elusive. Liu Chen couldn't pin down his whereabouts.
Soon after, Hong Bao secretly made a phone call to Liu Chen, saying that some of his brothers had met with misfortune.