The story of 'Marry My Husband' manhwa focuses on themes of love, betrayal, and self-discovery. The main character has to navigate through various obstacles to find her true happiness.
To win over your husband in a manhwa, first, focus on building trust. Be supportive of his dreams and hobbies. And don't forget to show appreciation for the things he does for you.
You could start by having an honest conversation with him and expressing your feelings. Maybe try to figure out what went wrong and work on changing those things.