I’D Rather Marry A Spirit Tablet Than Be A Concubine

My cousin and I were engaged at the same time. She was engaged to the heir to the duke's house, and I was engaged to the second son.
But the eldest son died in battle, and the second son has now become the heir. To escape her reputation as a husband killer, my cousin turned to my fianc.
On the eve of our wedding, my fianc decided to take her as his first wife and me as his concubine.
Everyone thought I would either swallow my pride or defiantly refuse this union. Instead, I declared, "I will marry the deceased young master instead. "
Become a concubine? No!
I'd rather marry a spirit tablet.