I don't think Byul's feelings are rushed. We got hints earlier that he was interested in him, he followed him around, asked people about him which showed signs of typical teen crush. Maybe it's not yet developed to be mature, romantic love, because it takes time and a lot of work, but he could catch feelings this quick. I think for the rest of the story, author will explore path that it takes teenage love to grow into adult love, or how feeling doesn't always fix everything ╮(￣▽￣)╭
I don't think Byul's feelings are rushed. We got hints earlier that he was interested in him, he followed him around, asked people about him which showed signs of typical teen crush. Maybe it's not yet developed to be mature, romantic love, because it takes time and a lot of work, but he could catch feelings this quick. I think for the rest of the story, author will explore path that it takes teenage love to grow into adult love, or how feeling doesn't always fix everything ╮(￣▽￣)╭