Here are some popular recommendations for ancient costume novels with the theme of "先婚后愛" (first marriage, then love):
1. "夫人第九十九次離婚" (Madam's 99th Divorce): This novel is a story of a wealthy family. The female protagonist and a professor get married first and then develop love.
2. "先婚后愛,獨(dú)占落跑嬌妻" (First Marriage, Exclusive Runaway Wife): Another novel in the wealthy family genre, where the female protagonist mistakenly believes that her husband is...
3. "長(zhǎng)安第一美人" (The First Beauty of Chang'an): In this novel, the female protagonist starts as the concubine of the male lead due to her family's decline. It can be considered a story of first marriage and then love. The male lead is reborn and has memories of their past life, where the female protagonist was the person he loved but couldn't have. They gradually fall in love with each other after being forced into the relationship, and the male lead officially marries the female protagonist.
4. "良陳美錦" (Good Chen, Beautiful Brocade): Unfortunately, there is not enough information available about this novel to provide a detailed summary.
Please note that the provided search results may not be comprehensive, and there may be other popular novels in the genre of "先婚后愛" that are not mentioned here.