He's in Shugo Chara!. He's the antagonist who becomes a protagonist that works for Easter Corp. and enjoys teasing the main character. He is known for having blue cat ears that show up whenever he combine with Yoru, his would-be self.
What do 당신 mean? The show isn't rude at all. It's very cute. If 당신 mean Ikuto, he's kind of aloof and mysterious, and he tends to be perverted towards Amu a lot. But othe than thought, no, neither is rude.
