First of all, Liu Bowen is familiar with astronomy and geography, and he will try his best to prevent Zhu Yuanzhang from sending troops to attack Japan. Can he forget the example of Kublai Khan?
At that time, the Yuan Dynasty was just established. If it is wiped out, it will have a very serious impact on the whole court. What people need is peace and stability, not the ups and downs of war. If a country has just been established, people will be displaced by war, then it is doomed to be unpopular. As a farmer himself, Zhu Yuanzhang felt deeply about what Liu Bowen said, so he listened to Liu Bowen and didn't attack the Japanese.
Liu Bowen is also a politician. He has always believed that Japan is blessed by nature and surrounded by the sea. This position is unfavorable to the Ming Dynasty. Surrounded by the sea, it was difficult for the Ming Dynasty to attack and the risk of failure was great.
If we rush forward, it will not only destroy the newly established new country, but also have a very serious impact on the people. Because of this, Liu Bowen advised Zhu Yuanzhang not to make a move. It is safer to wait until the country becomes stronger and stronger, and then choose to attack them.