Trueee. Plus, imagine living YEARS of eungyo outrightly showing his displeasure about sunwoo to the point that everyone in their circles know eungyo hated sunwoo. How could the brother suddenly thinks that eungyo actually likes sunwoo. Even eungyo just realised his feelings about sunwoo recently. Like, i understand people not liking how the brother kept berating sunwoo, but his arguments are actually logical based on the information he has known for YEARS.
Right, every one here so biased and quick to hate the brother but his actions are completely reasonable. AND EVERYONE KNOWS about the attitude and character of ML, they even describe him to be someone not to mess with.
If you really think about it, everything that the brother is saying is completely logical and right since ML never showed any interest to MC or expressed it outright in front of MC. If he just say what he wants to mc, any miscommunication could be avoided. But even after knowing mc is an airhead, he still wants him to take a hint.