No MC, cutting his head is too light of a punishment; you should cut both of his hands and let him suffer for the rest of his life (since a swordsman's life is over when his both hands are gone) and I don't mind you cutting that shizaru something bi***'s head.
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@H i s o k a that's why I said to let him live (with his both limbs cut off as a price for making the MCs niece/his daughter sad) and kill that charming bi***
@Sam You do realise that once the Sword King breaks free, he will become the one of the strongest ally due to his power being actually insane level. So, cutting off his arms after breaking him from that bi***'s hypno sounds stupid.
@Md. Anisul Islam I think japan must've prepared something in case the charm on sword king wears off... Unless they're not idiots, they'll kill sword king before he turns against them