Kang Senggui, a Hong Kong teacher, was a powerful "Happy Ghost" in his previous life. With the help of the "Happy Ghost", he has super powers beyond ordinary people. Annie, the daughter of the principal, is Kang Senggui's girlfriend, and the two are very affectionate. One day, four naughty students in Kang Senggui's class were teased and drifted to the wilderness. They accidentally picked up a set of armor of an ancient general and brought it back to the dormitory. The soul of this ancient general became a spirit because he absorbed the yang energy of the four people. When he saw the photo of the four students and Kang Senggui and his girlfriend, the past life came to his mind again. It turned out that Annie killed the general in his previous life, and the general's spirit was determined to take revenge in this life!