Character development is a big part. The characters have to change their initial negative views of each other. In a good 'enemies to lovers' BL novel, you'll see how they gradually start to understand and care for one another. For instance, they might discover shared traumas or interests that bridge the gap between them.
You could also check out 'Given'. Ritsuka and Mafuyu have some initial friction. Ritsuka is a bit cold towards Mafuyu at the start. But through their shared love for music, they grow closer and develop a deep, loving relationship.
BL manhwa refers to Boys' Love comics or graphic novels that come from South Korea and feature romantic or intimate relationships between male characters.
Well, a rut bl manhwa usually features male-male romantic relationships and explores various themes related to love and emotions. It's a popular genre in the world of manga.
One important method is through dialogue. As they start to talk more, they begin to understand each other's motives and personalities. In some novels, a gradual revelation of the characters' true selves plays a big role. For instance, the 'enemy' might show a vulnerable side that the other character didn't expect. This can break down the barriers between them. Also, the setting can contribute. If they are in a new and unfamiliar place together, it can force them to depend on each other and change their relationship dynamic.