Ah-반말 (panmal).. it means talking without being polite. Usually, it is used when an older person talks to a younger person. Or a talk between friends or someone who has an authority like the way a master (Charlotte) talks to her disciples..
Thank you for the translation. However if you want to continue I believe you should pick a better font. Comic-sans or some variation seem to be the status quo. Your current font is a bit difficult to read.