When to use indoors in Korean
Korean: 실내[ sil-nae ]

When to use it
실내 means indoors or inside a building. Use it when you talk about something that happens inside, not outside. You can use it for places, activities, or things used inside, like indoor shoes or an indoor pool.
Example sentences
집에서는 실내화를 신어요.
At home, I wear indoor slippers.
오늘은 추워서 실내에서 운동해요.
It is cold today, so I exercise indoors.
학교 실내에서는 뛰지 마세요.
Please don't run indoors at school.
이 식물은 실내에서 잘 자라요.
This plant grows well indoors.
우리는 실내 수영장에 갔어요.
We went to the indoor pool.
비행기를 기다리면서 실내에서 쉬어요.
I rest indoors while waiting for the plane.