This is a person trying to get someone else to tell them something. 잘못했다구요? 뭘 잘못했는데요? 말해봐요, 한번! 어디 다시 한번 그랬다간 그땐…… 정말 알아서 하라구요! I'm having a problem understand the last sentence from 어디 다시. I'm guessing the ending with 알아서 하라구요 is something along the lines of "Just tell me already!", but I'm not sure. The rest before that I don't understand how it goes together either. I'd appreciate any help. Thanks!