"아니, 내가 너의 아버지다."
Translation:No, I am your father.
Common misconception. They are talking about what Obi Wan told Luke when he says, "He told me you killed him!" Vader replies directly with, "No, I am your father..." People often say it with Luke's name anyway, for reference. Then of course some nerd has to step in and tell everyone that it's a common misconception.