Doraemon: Help Li Bing Treat Water in the Beginning

Chen Mu was accidentally brought to the Qin Dynasty more than two thousand years ago by Doraemon's time tunnel. He met Li Bing who went to Shu to control floods, and decided to help Li Bing control the flooding rivers. He single-handedly protected living beings in the prehistoric era. In ancient times, he guided the ancestors step by step in building nests to avoid disasters, drilling wood to make fire, and tying ropes to record events. He and Zhuge Liang explored the tomb. He breathed with the ancestors millions of years ago. He wandered through the vast river of history, exploring the eternal mysteries in the dusty years. Looking back, he was shocked to realize that he had lived in every moment of history.