Poverty-stricken youth He Qiusheng spares no expense, spending his mother's life-saving money to rescue a dying purple snake. To repay the kindness of saving its life, the snake not only cures He's mother of her stubborn illness, but also guides Qiusheng in reclaiming wasteland to gain wealth, issues early warnings for natural disasters, and saves the entire village. Facing the greed and framing of villains, man and snake hand in hand weather numerous hardships. Ultimately, the purple snake achieves full karmic merit, transforms into a golden dragon and ascends, leaving blessings to protect three generations of the He family, writing a folk legend of good deeds receiving good rewards.