관심이 · 관심을
interest, concern
Example
저는 요즘 한국 음악에 관심이 많아요.
I'm really interested in Korean music these days.
Word parts
관 relate+심 heart, mind
Literally 'the heart connected' — your mind is tied to something.
Good to know
Use the particle 에: 음악에 관심이 있어요 'I'm interested in music' — not 을/를.