속 -- inside.

This word is usually used for things which are enclosed. It is employed with the locative particles 에 or (으)로.

[edit] Examples

• 가방 속에 공책 있어요 There's a notebook in my bag.

[edit] Proverbs

• 말 속에 말 들었다 I heard the words within the words
• 글 속에도 글 있고 말 속에도 말 있다 There is writing within writing as there are words within words