Perhaps it's a story where the husband has been hiding his adventurous spirit or a very romantic side. In the novel, the wife might start to notice little things that gradually show her this new, exciting side of her husband. For example, he could secretly be writing beautiful poetry or be involved in some thrilling hobby that makes him seem more appealing.
Since it's called 'My Secretly Hot Husband', the main characters are likely the wife and the husband. There may also be some secondary characters like friends or family members who play a role in the story, perhaps by either helping or hindering the wife's discovery of her husband's 'hot' qualities.
Well, you could try doing things he likes together to strengthen the bond. Also, showing appreciation and support for him can go a long way. Sometimes, small gestures of love and care can make a big difference.
One way could be to have heart-to-heart conversations regularly, listen to his perspective, and work on resolving any conflicts together. Surprising him with small gestures of love and support might also make a difference.
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.