No, I'm with Roger on this. Imagine the pain she caused him, for him, a knight, to break his promise. She fucked this up and how much she suffers is the consequences of only her actions.
Lionel seems like he has the potential to become the ignorant lovelorn father's who disregard and ignore his children once his wife dies and mop around in misery, similar to those seen in some manhwas.
Mieum is an angel, and no matter how hawt and beautiful you are Jitae, I'll never forgive you or anyone to ever hurt him