Well its clearly Leegang's fault. Even if its not intentional, its 100% common sense that what he says and the way he acts implies a strongly motivated interests which is associated to love in most cases.
Well I kinda agree about Leegang should make it more common sense. But, knowing Leegang's personality, he doesn't care one bit about anything so as long as he knows what he's doing, he had the feel that he doesn't need to explain it. Still, it's good the in a few chapters
Leegang's intentions will finally be known.
He isnt doing anything "wrong" but the misunderstanding is still his fault. As you said, he might not feel the need to even to explain himself. But even that is a bad excuse plot wise. Considering Leegang wants to know more about Daniel, and knowing that Felix likes Daniel. It would be easier to get info from Felix if he wasnt seen as a rival.
So its obviously all just a play made by the author, going against common sense, only to bring something to the story.
Well, technically yes. Even tho Leegang's character suits him, he should be more straight forward and stop doing those small phrases and confusing statements. Well, it's good that he got what he deserves for being confusing in chapter 127. That's must've hurt but no bad injuries and he's still alive so he's fine.
Felix have the right to have misunderstandings on what Leegang said It's true that Leegang's intentions aren't bad but the way he puts it.. "I'm interested in the General Manager." When he knows Felix likes the General Manager too, makes it look like he likes the General Manager. Of course, not all interest are romantically but the first thing you will think about interest is "Like". So Leegang, I love you and all but keep your damn words clear, honey. Ya making a thousand of people confused by your statement.