Honestly, I'm here not because of the plot nor the romance, but solely because of the siblings. I've never read any sibling interaction as entertaining as them. Any recs?
It started good, but her reason was not strong enough too justify her goal of divorcing her husband. The flashback also contradicts everything; it gives more plot holes than explaining. Previously, it says that the spouses lived lovingly before the blind cousin started living with them; then...
I think the white-haired 5th disciple and the demon king are one and the same. Maybe the demon king reincarnated into the 5th disciple. Or, maybe he was absorbed when the 5th disciple went into a journey to find Charlotte; hence, why the 5th disciple disappeared.