별건

anything special, anything important

→ 별것+은
noun Rare #29,454
anything special, anything important A shortened colloquial form of 별것은, often heard in phrases like 별건 아니에요 (“It’s nothing special”).
KO: 별건 아니에요.
EN: It’s nothing special.

별건 아녜요

It's no big deal.

— 거울 (1975)

별건 아니고 그냥 좀 해보는 거 야

It's nothing special; I'm just giving it a try.

— 빅 식 (2017)