Kung Kwan and Ko Lap are the best friend, both are the professional killer. Kung Kwan is retired and has his well business & perfect family. Once upon a time, he goes back to his home in China for visiting, he comes across an old friend with much pleasant. But Unexpectedly, his wife reveals that his old friend is the murderer of her father, and the instigator is her father best friend. Ko Lap and Kung Kwan are then became the enemies, a couple is then pursued to be killed.