Spoiling the Captive Warlord

I woke up in the body of Shirin Rostami, the most arrogant heiress of the Parsis Empire, right in the middle of her lavish engagement banquet. The evening's main entertainment? Mocking Iskandar, the captive general of the Qara Steppes, currently bleeding in chains on the marble floor. The novel said this moment birthed the villain who would one day burn our empire to ash. But looking at his battered state, I couldn't play the villainess. Instead of spitting on him, I threw my engagement ring at the Crown Prince, broke off the wedding, and used my entire dowry to claim the prisoner. Now, I'm penniless, living in an inherited ruin, and spending my last gold coins on rare medicines and velvet coats for a man who is supposed to be a ruthless killer. Strangely, the terrifying general seems incredibly fragile, coughing pitifully every time I try to leave the room so I'll rush back to hold him. But as I uncover clues left behind by the original Shirin, I realize my transmigration is no accident. Did I possess a stranger, or did my past self orchestrate this entire timeline just to save the monster she couldn't stop loving?