
At this point he has spent a decade thinking the MC is under his spell. Imagine what will happen when he calls her Duroa to break the spell and nothing happens. Ohhh how fun will it be to see his reaction and learn that all this time she has been by his side willingly. Then again I am assuming she's imune to his magic. I am not quite sure if that is a fact though, just a suspicion.
I was having a deja-vu reading this and then I remembered I actually read a bit of the novel ages ago so glad it has a webtoon now!