In "Do You Know", why did Sun Xiucai harm Shulan?

Sun Xiucai had nothing but his status as a "scholar" and his family was poor. However, he treated Shulan badly, who had a rich dowry. Later, he was unwilling to divorce and only wanted to divorce Shulan to corrupt her. Lan's reputation. These are all because Sun Xiucai cannot clearly understand himself. "Scholar"

Sun Xiucai was originally supposed to be a very outstanding figure. When he was young, a fortune teller told him that he was destined to be a prime minister, so he made up his mind to become a top official. Jinshi, but his ambition is as high as the sky and his destiny is as thin as paper. He passed the scholar examination when he was twelve years old. Until now, he is still just a scholar. However, he also thinks he is noble and looks down on his wife Shulan, who comes from a merchant family.

Sun Xiucai's confusion about himself reached its peak when he was chosen as his son-in-law by the eldest son of the Sheng family. The eldest son of the Sheng family, who owns a large family fortune, is willing to marry his pretty daughter to a young scholar. This shows that he is interested in his future. A merchant family can establish a relationship with a future two-ranked Jinshi. Sun Xiucai thinks this It's a high climb. Even if he had nothing at the moment but a reputation as a scholar, in his heart, Shulan marrying him was still a blessing that the other party had cultivated over several lifetimes. Shameless Sun Xiucai

Sun Xiucai looked down on his wife Shulan, who came from a merchant family, and disliked Shulan for being unable to have children. Shulan then took twenty or thirty concubines for Sun Xiucai. Sun Xiucai was still not satisfied and felt that it was boring to abandon these good concubines, so he redeemed himself in a brothel for a woman who was pregnant with his child. After that, Sun Xiucai wanted to welcome her in.

Sun Xiucai paid for visiting brothels and redeeming prostitutes with Shulan’s dowry. The food, drink, and servants of the Sun family all belonged to the Sheng family, and the money he spent on studying also came from the Sheng family. Sun Xiucai is a soft-cooked man. Kong has the ability to study, but he has to be a worm, living off Shulan, and pretending to maintain his noble image as a scholar. The two reconciled, but Sun Xiucai was only willing to divorce his wife, leaving Shulan an abandoned wife. But he was greedy for Shulan's dowry and had no choice but to divorce. In the original work, Sun Xiucai and Shulan's reconciliation did not end well, and they deserved their punishment.

Sun Xiucai squandered Shulan’s dowry to take in concubines and support his wife. He pretended to be a man of culture and kept talking about being “disgraceful to gentlemen” all day long, but behind his back he committed domestic violence. He was really a man. Gentle scum.