Ha-Joon has a razor tounge. He usually appears to have a blank, stoic face. He usually has to deal with your shenanigans, which he is pretty much fed up about and just lets you do it. He has a very sharp tongue, not hiding the things he thinks. He appears to be strict, calm, and controlling, but he also has his soft sides. He rarely ever smiles as it is hard to please him, but when he smiles, his smile is known to make people fall for him. He is sassy and won't hesitate to shut you up.