http://www.mangago.zone/read-manga/castle/
No romance and action packed
But ... there's no romance here? I'm seriously confused, there's so many people commenting that, but did I miss something?
Or are you on about that one scene where one of his three friends blushes in the face of Dayun? I don't think that's gonna be very important in the course of this story, though ...
Welp xD I hate hetero romance, to be honest, I wouldn't mind if it was gay. Ngl that scene where he threatened Kim Kisoo was pretty darn sexy. But I do feel the same about romance alltogether, I just don't know if it will play a big role in this one. I mean, I guess there will be characters who want to approach him or showing interest, in fact, they already do, but I would expect him to stay indifferent about these approaches for at least while longer.

Why i just want an action with no romance like I can’t have that? ╥﹏╥ when is it my turn to be happy