I have no clear idea about 'juego a ciegas manhwa tmo'. It could potentially be a code or a term related to a niche subculture. Maybe you can provide more information to help figure it out.
In a define the relationship novel, the emotional journey of the characters is central. The readers need to be able to feel the characters' joys, sorrows, and confusions regarding their relationship. The pacing of the relationship development also matters. It can't be too rushed or too slow. A good define the relationship novel will also explore different relationship stages, from initial attraction to deeper commitment, and show how the characters adapt and change during these stages.
Well, manhwa is Korean comics and corn is a type of crop. There's really no obvious relationship between the two. Maybe in some very specific and rare context there could be, but generally speaking, they're completely different things.