When to use before noon in Korean
Korean: 오전[ o-jeon ]

When to use it
"Before noon" means the time in the morning, from midnight until 12:00 p.m. In Korean, 오전 is used when talking about time, plans, or weather earlier in the day. You can use it with a specific time, like 9 a.m., or by itself to mean "in the morning."
Example sentences
오전에 비가 와요.
It rains before noon.
오늘 오전에는 바람이 많이 불어요.
It is very windy this morning.
오전 수업 전에 날씨를 확인해요.
I check the weather before morning class.
오전에 공원에서 산책해요.
I take a walk in the park in the morning.
우리는 오전에 우산을 샀어요.
We bought an umbrella in the morning.
비행기는 오전 열 시에 출발해요.
The plane leaves at 10 a.m.