으니깐요

Polite 'because, you see'

-으니깐요 supplies the reason for what was just said, aimed politely at the listener: 실수를 하고 싶지 않으니깐요 'because I don't want to make a mistake.' It is the relaxed spoken pronunciation of -으니까요, and it usually comes after the point it explains rather than before it. Every line here is casual speech that keeps the polite 요.

Register: polite but casual