There are many legendary Door Gods in different periods of Chinese history. The most ancient are Shen Tu and Yu Le. According to the stories found in old books, Shen Tu and Yu Le helped the Yellow Emperor to manage the kingdom of spirits and ghosts under an enormous plum tree. Those spirits were afraid not only of the two Gods, but also of golden roosters and tigers. The story of the picture book tells us that we must keep a kind heart whatever we do or think, for no matter whether they are spirits or humans, kind people will always be loved and supported while bad people will always be punished eventually for the wrong things they do.