하늘을

the sky

→ 하늘
phrase Uncommon #12,671
the sky 하늘 means “sky,” and 을 marks it as the object of the verb. With verbs like 날다 (“to fly”), it can refer to flying through the sky.
KO: 새들이 하늘을 날아요.
EN: Birds fly in the sky.

돼지 라고 왜 하늘을 못 봐요?

Why can’t a pig look at the sky?

— Tune in for Love (2019)