Why are you looking at me? 왜 쳐다봐? -You can say that when anybody look you Why are you looking at me like that? 왜 그렇게 쳐다봐? -You can use this sentense when someone stare you little bit long time or strangely or non-generally or etc. When you think there are some reason that someone look at you. Is something on my face? 내 얼굴에 뭐 묻었어? It has a same mean - "why are you looking at me like that?" What's wrong? 무슨일이야 There's nothing wrong. Everything is fine. 별 일 없어. 다 좋아. What's wrong with me? 나에게 무슨일이 생긴거지? What's wrong with you? 무슨일이야? Why are you like that? 너 왜 그래?