니까 되다

it works because you did that

-(으)니까 gives a reason and 되다 here means 'it works / it comes off'. The speaker has just seen something succeed and names what made it succeed: 유재석이니까 되는 거 같아요 (it works because it's you), 진짜 노릇하게 하니까 되네 (crisping it up actually works). Compare -면 되다, which prescribes in advance ('you just have to do X'); -니까 되다 reports after the fact that it turned out to work.

Register: casual, often a surprised discovery