Chi Yan always had a weak constitution, and ghosts had always tried to kill him. He tried many methods; seeking help from others, praying to god, but to no avail.
Coincidentally, Third Master Ye of Shiming City passed away, and a priest informed Chi Yan than Third Master Ye possessed the 'look of demon' and carrying a bit of his ashes and installing an altar for him at home, could help control the evil spirits around Chi Yan.
Left with no choice, Chi Yan took a gamble. Amazingly, it worked. However he didn't expect to be haunted by the most persistent evil.
Obsessed with love, undying resentment, possessed by evil.