The Self-Cultivation of a Waste of Time

I, Zhang Yuan, am a former social beast and an active short-lived ghost in the wilderness. Others who traveled through time were either descendants of powerful people or innate Tao bodies. As for me, I started with a body of a Wu Clan with exhausted blood, plus an underage green bull that could only moan "moo". But it's not a big problem! Master Wu, I relied on my agility in squeezing the subway in my previous life and frantically picked up trash on the ancient battlefield. I relied on my "Chaos Rice King" and "Yeluzi Cultivation System" to survive. Master Wu, I just want to farm and raise cattle at home, but the prehistoric world is too complicated, so I am forced to run all the way on the road, stirring up the wind and clouds.