그러면 안

you mustn't do that

→ 그러면

phrase Uncommon #5,894

you mustn't do that Usually followed by 돼 or 되다, as in 그러면 안 돼. Used to say that an action is not allowed or should not be done; the tone can range from gentle advice to a firm prohibition.

KO: 여기서 사진을 찍으면 그러면 안 돼요.

EN: You mustn't take pictures here.

그러면 안 그려요?

Then you won't draw it?

— 타오르는 여인의 초상 (2019)