The Only One You’d Spare [Rewritten]

You are hellbent on revenge against all who wronged you... You were going back in time to make sure they all suffered for what they did... Everyone, that is... except them. That one person is one you didn't get a chance to meet until it was too late before, but now... Now, you may be able to protect them. Now, maybe you can spare the both of you from your eventual cruel fate. --- This one is not a request, but an idea that has been kicking around in my head. I feel like isekai is something I want to toy with more. It is slightly based on a manhua I have been enjoying called "The Villain Duke's Precious One", which is adorable and I highly recommend.