잘못이다

be one's fault

→ 잘못
phrase Rare #28,144
be one's fault The person responsible is usually marked with 내 (my), 네 (your), or another possessive form.
KO: 이번에는 내 잘못이다.
EN: This time, it's my fault.

쥬산, 이건 네 잘못 이다

Jusan, this is your fault.

— 패왕별희 (1993)

내 잘못 이다

It's my fault.

— Pandora (2016)