보낸 것

what was sent

→ 보내다
phrase Common #3,447
what was sent 보낸 is the past-tense modifier of 보내다 (to send), and 것 means “thing.” Together, the phrase can mean “what someone sent” or “the fact that someone sent something,” depending on context.
KO: 네가 보낸 것은 잘 받았어.
EN: I received what you sent.

네 아버지가 대학에 보낸 것 잘한 일 이야

It was a good thing that your father sent you to college.

— 음식남녀 (1994)