Help me find this straight webtoon (i think)

I'm not sure what straight stories are called because i don't read many but one captivated my attention. The fl in this is blond and is married to a silver haired guy later she wants divorce and then she leaves in a train for countryside i think, leaving the royal palace and the prince or the king idk finds the divorce papers but believes it's a tantrum and she's not serious but like- she is and then his side of the family visit her and have discussion over tea and then she firmly refuses to come back still and the ml finally realises she is serious about seperation. Please help me find it. The fl is rather an interesting character I'd like to know what she does next.