在意
zàiyì · HSK 7
care about
👂 在 = at + 意 = mind; to hold something at mind, to care about it
在意 zàiyì stacks 在 (to be at, located in) onto 意 (mind, intention, meaning): to keep a thing located at your mind is to take notice of it and take it to heart. The 心 heart radical sits under 意, marking it as a matter of feeling you mind.
在 — earth 土 + phonetic 才
Originally a phono-semantic compound: 土 (earth) gives the meaning of a place or location, while 才 supplies the sound. It came to mean 'to be present/located at,' and now also serves as a grammatical marker for ongoing actions, like 'in the middle of doing.'