조심해야 해

have to be careful

→ 조심하다
phrase Uncommon #9,927
have to be careful Casual form; 조심해야 해요 is polite, and 조심해야 한다 is more formal or written.
KO: 밤길에는 조심해야 해.
EN: You have to be careful at night.

근데 조심해야 해.

But you have to be careful.

— 햄넷 (2025)

조심해야 해

You need to be careful.

— 그을린 사랑 (2010)

재앙신은 조심해야 해

You have to be careful around the calamity god.

— 모노노케 히메 (1997)

그래도 조심해야 해

Even so, you still need to be careful.

— 인생 (1994)

조심해야 해!

You have to be careful!

— 마루 밑 아리에티 (2010)

앞으론 그녀를 조심해야 해

From now on, you need to watch out for her.

— 400번의 구타 (1959)