Tragic death on wedding night, replacement doctor concubine reborn to kill the whole family

Su Yun didn't know until she died that she was a cannon fodder in a group love story. The heroine was her twin sister. From childhood to adulthood, all the love was given to her sister Su Yuxi. No matter how hard she tried and how good she was to her family, they never took her seriously. She married the notorious and tyrannical Huainan King Xiao Lusheng in place of her sister. On the day of the wedding, she escaped from the marriage and was caught. Her hands and feet were broken on the spot and she was sent back to the Su family. However, the Su family, her most beloved family, closed their doors, fearing that they would be related to her and implicated by her. She froze to death in that cold winter. Opening her eyes again...