After twenty years, eighty-years-old’s Ren Zhongyuan coming back to Saihanba. Sixty years earlier, in his twenties, it was all desert. No one could believe that 300 people can make this curse land into one of the biggest forest in china. As a young engineer, Ren redesigned the old planting machines by himself, and fall in love with the nature he helped to create. Walking again between the trees makes him thinking about his age, his love, his art, his challenge, and his glory.