Su Zhan understood a truth in the bloody night when his family was wiped out: in this world, good people don't live long. He dug out the last bit of softness in his heart with his own hands, and from then on he only asked about pros and cons when doing things, without distinguishing between good and evil. But when he embarked on this road of proving the Tao through killing, he discovered that "conscience" can be chopped off, but cannot be avoided.