riheoseoreun yeonseupsireseo yeoseos sie sijakhae.

-은 is the topic particle. It marks 리허설 as the thing being talked about.

So 리허설은 means something like:

• as for the rehearsal
• the rehearsal

In Korean, the topic particle does not always match the English idea of a grammatical subject. It often sets the topic first, and then the rest of the sentence says something about it.

It can also carry a slight contrast depending on context, like as for the rehearsal, ..., but in a simple sentence like this, it usually just marks the topic naturally.

-에서 is used for the place where an action or event happens.

Here, 시작해 means starts / begins, and the beginning of the rehearsal is happening in the practice room, so Korean uses 연습실에서.

A simple way to think about it:

• -에 = destination, location of existence, or time
• -에서 = place where an action happens

So:

• 연습실에서 시작해 = it starts in the practice room

Korean usually uses native Korean numbers for hours.

That is why you get:

• 한 시 = 1 o’clock
• 두 시 = 2 o’clock
• 세 시 = 3 o’clock
• 네 시 = 4 o’clock
• 다섯 시 = 5 o’clock
• 여섯 시 = 6 o’clock

육 is a Sino-Korean number, and Sino-Korean numbers are used for many other things, but hours on the clock normally use native Korean numbers.

So 여섯 시 is the normal form here.

시 means o’clock when telling time.

So:

• 여섯 시 = six o’clock

The particle -에 is used with specific points in time, so:

• 여섯 시에 = at six o’clock

This is very common in Korean:

• 세 시에 = at 3 o’clock
• 월요일에 = on Monday
• 봄에 = in spring

So 여섯 시에 means at six o’clock.

시작해 is the casual, non-polite form.

It would be used with:

• friends
• family
• people younger than you
• informal dialogue
• notes or casual speech

Other versions are:

• 시작해요 = polite, everyday neutral
• 시작합니다 = formal

So the sentence changes in politeness like this:

• 리허설은 연습실에서 여섯 시에 시작해.
  casual
• 리허설은 연습실에서 여섯 시에 시작해요.
  polite
• 리허설은 연습실에서 여섯 시에 시작합니다.
  formal

Korean very often leaves out subjects and objects when they are already clear from context.

Here, 리허설은 already sets the topic, so Korean does not need an extra word equivalent to it.

English often requires a subject in every sentence, but Korean does not. Once the topic is introduced, the rest of the sentence can simply describe it.

So this is completely normal Korean.

Formally, 시작해 is a present-tense form, but Korean often uses the present tense for scheduled future events.

So in this sentence, it can naturally mean:

• starts at six
  or
• will start at six

This is similar to English sentences like:

• The movie starts at 8.
• My class begins tomorrow.

So even though the form looks present, the meaning can refer to a planned future event.

Korean normally puts the verb at the end.

English is usually more like:

• subject + verb + other information

Korean is usually more like:

• topic/subject + place + time + verb

So this sentence is structured like:

• 리허설은 = as for the rehearsal
• 연습실에서 = in the practice room
• 여섯 시에 = at six o’clock
• 시작해 = starts

That final-verb pattern is one of the most important differences between Korean and English.

Yes, Korean word order is somewhat flexible, as long as the particles stay attached to the right words.

For example, these are both understandable:

• 리허설은 연습실에서 여섯 시에 시작해.
• 리허설은 여섯 시에 연습실에서 시작해.

The first version sounds very natural. The second is also possible, but the emphasis may feel a little different depending on context.

Even though Korean is flexible, the verb still usually stays at the end.

No. 리허설 is a loanword from English rehearsal.

Korean has many loanwords, especially for modern, artistic, technical, or international concepts.

So 리허설 is written in Hangul, but it comes from English pronunciation adapted to Korean sound patterns.

연습실 literally breaks down like this:

• 연습 = practice
• 실 = room

So 연습실 means practice room or rehearsal room.

This kind of compound noun is very common in Korean. Once you know the parts, it becomes easier to recognize similar words. For example:

• 교실 = classroom
• 회의실 = meeting room
• 병실 = hospital room