잔액이 · 잔액을
balance (remaining amount)
Example
교통카드 잔액이 부족해서 지하철역에서 충전했어요.
My transit card balance was low, so I topped it up at the subway station.
Word parts
잔 remaining+액 amount
Literally 'remaining amount'.
Good to know
You'll hear 잔액이 부족합니다 on Korean buses when your card runs low.
Related words