Wu Xin is an immortal who doesn't know where he was from, how long he lived, or what he is. He wanders the earth with no purpose in life and no money. During one of his destitute spells, he meets Yue Ya who gives him her last morsel of food. To repay her kindness and get more food in their stomach, he decides to capitalize his only skill set: Killing monsters. They begin a wondrous and often dangerous adventure of fighting supernatural evil, one paying customer at a time.

An immortal Taoist Master with no heart seeks his own death because he’s fed up with living. In his journey seeking death, he encounters mysteries, murders and crimes and eventually falls in love all over again. What is it like for an immortal and a mortal to fall in love with each other? Most people seek immortality, but have we thought of what it would be like as Wu Xin is experiencing?