Why did Zhou Shuren and Zhou Zuoren take different paths?

The direct reason why Zhou Shuren and Zhou Zuoren took different paths was Zhou Zuoren's wife.

The mother of the Zhou brothers once said to someone, "It's really beyond my expectation that such a good brother suddenly got into trouble and couldn't live in a house. I thought about it, but I couldn't figure out why. I only remember: your husband has a problem with his mistress, because she is too ostentatious and has no intention of spending money, which often makes the family make ends meet. It is not good to borrow from others. "

Related events:

Zhou Zuoren's wife, Yutai Shinko. When Lu Xun and Zhou Zuoren were studying in Japan, their lives were taken care of by Yoko Yutai, a Japanese maid, who washed and cooked. Later, Yutai Shinko and Zhou Zuoren became attached for a long time and fell in love. Yutai Xinzi returned to China with Zhou Zuoren and became his wife.

19 19, Lu Xun bought a house in Badaowan, Beiping, and took his mother, his second brother Zhou Zuoren and his third brother Zhou in to live together. It is also living together that lays the groundwork for future disasters. Lu Xun and Zhou Zuoren broke up and never spoke again for life. The culprit is his sister-in-law Yu Taixin.