Black and white Wu Chang, holding shackles and handcuffs, specializes in hunting down ghosts, helping to reward good and punish evil. Xie Chen, as a good young man who died accidentally due to a natural disaster, except that his eyes are a little more ferocious and his temper is a little more grumpy, he claims to be a competent Wu Chang. However, more and more events are happening around him, and behind one strange case after another, thousands of years of past events have been revealed. Thousands of years of protection, just because of one thought.