잘 쓰고

write well and

→ 잘
phrase Uncommon #11,292
write well and 쓰다 can mean “write” or “use,” depending on the object.
KO: 편지를 잘 쓰고 우체통에 넣었어요.
EN: I wrote the letter well and put it in the mailbox.

아직도 잘 쓰고 있잖아.

You're still using it just fine.

— 발레리나 (2025)

잘 쓰고 돌려줘

Use it carefully and give it back to me.

— 패신저 57 (1992)