Lin Yan once refused a black-hearted business for protecting the mountain forest and the green fox, but was framed by his partner Zhao Hongbing with false testimony, losing the forest farm and his reputation, and biding his time for eight years. Qing Wu, who transformed and returned to repay a kindness, assists him, accompanying him to collect account books, human witnesses, and ironclad evidence of smuggling, breaking through family betrayal and layers of obstruction, lawfully overturning the case and taking back the forest farm. Facing the temptation of huge benefits, Lin Yan still adheres to the ecological bottom line, and Qing Wu also gains a new life in the feedback of good intentions, the two staying together and making promises to each other in guarding the mountain and forest.