Bl as slow as the movement of glaciers. Be prepared for 100 or 200 chapters of action and camaraderie before the MC understands what he's actually feeling. And don't expect anything explicit until the side stories. Having said all that - it's with it tho. Every step. And the payoff is so so good.
In the novel they had chemistry from their first meeting, the MC just didn't want to acknowledge it. Or maybe both. There will be progress, don't worry. But the whole story is more about the story and not about romance.
I just want to know before I start, is this BL? does it have any type of development in their relationship?