Reborn After a Tragic Death, the Duke’s Cousin Turns Dark

In her previous life, Song Li devoted herself to Jiang Qi and willingly became his concubine. In the end, she met a horrible death. Reborn, she curries favor with the princess consort and schemes against the Duke's household, all to secure a better future for herself. But why does the person she was supposed to abandon keep coming back to her, again and again?