In his previous life, he was deceived by a scumbag and killed the prince, and ended up being tortured by having his bones eviscerated. Come back to life to torture the scum and save the prince. And he respected the prince very much to make up for the sins of his previous life. But something was getting more and more wrong with the prince, making him think it was his own illusion. A certain prince pretended to be pitiful and said
"Mumu, it hurts~"
Intention: sudden thought