You Called Off Our Engagement Because I Was a Good-for-Nothing. Now I'll Train My Substitute Bride into an Empress!

“Chu Nan, I can break off my engagement to the Holy Son of Leiyin. I can even accept that you've been with other women... Can we start over?” “I... I'll do anything for you, too!” When Gu Miaoyin learned that her senior sister had been transformed and forged into a Sacred Body with Chu Nan's help, she regretted everything! If she could go back in time, she would never have looked down on Chu Nan or forced her senior sister to marry in her place...