Actually I think the author might introduce the new lord as as a second ML.
Yk those disposable characters that only exist to make the seme realise his true love for the uke.
We might actually get a happy ending (hopefully)
He has fallen in love with Yeonjo but have yet to realise. He thought he was just obsessed with his toy. As much as I like angsty story, I still hope for a happy ending for uke.
I think he knows that he's in love with uke but well he wanted to kill him regardless so of course he won't admit his love
Seme probably in denial. Before, he was hoping if he treat Yeonjo well enough, they can be together like that. But in the end, he could not change the fact that Yeonjo wanted to take revenge against him. Just to keep him by his side, he does not care even if he has to break him.
But I think he care, you know how he has flashbacks about their time together but he doesn't know how to keep Yeonjo by his side so he wants to keep him by his side even if it means Yeonjo will hate him.
It's fruitless. I have feeling baby will be broken and likely seek death by suicide. Seme maybe in the end will seek death too in hope to gain some forgiveness by Yeonjo.
OR
The toy boy friend that got Yeonjo into this situation might seek help from the other lord that used to be with Yeonjo. The lord save Yeonjo and send him away to live a new life somewhere else. While seme got distracted searching for Yeonjo and lost his fight against the opponent that he is trying to get rid in Gilju and got overturned.