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말썽이야

is acting up

→ 말썽
phrase Rare #22,743
is acting up Informal spoken form of 말썽이다, used when a person, object, or body part is causing problems or not working properly.
KO: 컴퓨터가 또 말썽이야.
EN: The computer is acting up again.

망할 놈의 똥차, 또 말썽 이야

This damn piece-of-junk car is acting up again.

— 델리카트슨 사람들 (1991)

뭐가 말썽 이야?

What's the problem?

— 인터스텔라 (2014)

계단이 말썽 이야

The stairs are acting up.

— 델리카트슨 사람들 (1991)