第1章 贬妻为妾娶寡嫂？ 

Demoting one's wife to a concubine and marrying a widowed sister-in-law?

[Exchange of bride + palace intrigue + sisterly comparison + scumbag boyfriend and girlfriend's ultimate fate]

My cousin and I got engaged at the same time.

She married the heir of the Duke's family, and I married the second son.

It's quite a story that cousins ​​married their own brothers.

Who would have thought that the crown prince would die on the battlefield, and the title of duke would fall to the second son.

To get rid of her reputation for bringing bad luck to her husband, my cousin turned to my fiancé.

On the eve of my wedding, my fiancé asked me to request to become his concubine.

Although it is a bit unfair to you to be a concubine, what more could an orphan like you ask for than being able to marry into the Duke's mansion?

Your cousin is the legitimate daughter of a marquis; are you perhaps trying to outdo her and become the principal wife?

Everyone assumed that I would either compromise or stand firm and refuse to marry.

As a result, I told everyone: I want to marry the deceased young master.

...

【换嫁+宅斗打脸+姐妹对照组+渣男渣女火葬场】
  我与表姐同时定下亲事。
  她嫁国公府世子，我嫁次子。
  表姐妹同嫁亲兄弟，也算一段佳话。
  谁知世子战死沙场，公府爵位落在了次子头上。
  为摆脱克夫名声，表姐转头找上了我的未婚夫。
  出嫁前夕，未婚夫让我自请为妾。
  【虽为妾，有点委屈了你，但能够嫁进国公府，你一介孤女还有什么不满足的？
  你表姐是侯府嫡女，你莫不是还要压嫡女一头想做正妻？】
  所有人都以为，要么我委曲求全，要么我硬气不嫁。
  结果我对众人道：我要换嫁已故小公爷。
  ...