Just had a tought: can't Ren simply cut his own arm off to remove the bacelet ?
One of the most powerfull healer in the land is his best bud, it should be fine, right ?
Or maybe I just forgot about something that would prevent him to do that...
What prevents it is a thing called Shounen Plot Device to keep a Carboard Villain "relevant".
There's the minor bit where they don't know what'll happen to the Hero if they simply kill the king, BUT....
They could have sorted that when the MC neutralised the curse outside the king's sphere of influence and the bracelet could actually be taken off, but the Hero didn't. For Plot Reasons.
The moment that happened you could simply predict this happening... ummmm
3 years ago. Chapter 33 and following..
This has devolved into a hellish cocktail of Plotanium and sheer idiocy. As expected, but still... I had futile hope the author didn't slavishly follow the Tropes.