geu sungan yuri jogageul chajassseupnida.

Korean often leaves out the subject when it is already clear from context.

So 그 순간 유리 조각을 찾았습니다 could mean:

• I found a piece of glass at that moment
• He/She found a piece of glass at that moment
• They found glass fragments at that moment

The sentence is still natural without 저는, 제가, 그는, and so on. Korean does this much more often than English.

그 순간 means that moment or at that moment.

• 그 = that
• 순간 = moment, instant

In Korean, time expressions often appear without a particle, so 그 순간 by itself can mean at that moment.

Yes, you can say 그 순간에.

Both are possible:

• 그 순간
• 그 순간에

The version without 에 is very common and natural. Korean often drops particles after time expressions when the meaning is already clear.

Very roughly:

• 그 순간 = natural, concise
• 그 순간에 = a little more explicit or slightly more emphatic

It is a noun phrase made of two nouns:

• 유리 = glass
• 조각 = piece, fragment

So 유리 조각 literally means glass piece or glass fragment. In natural English, this is often translated as:

• a piece of glass
• a glass shard
• glass fragments

Korean often combines nouns directly, where English would use of, such as piece of glass.

The particle 을 marks the direct object of the verb.

Here, 유리 조각 is the thing being found, so it takes 을:

• 유리 조각을 찾았습니다

This tells you that 유리 조각 is what the action is happening to.

Because 조각 ends in a consonant, the correct object particle is 을.
If the noun ended in a vowel, you would use 를 instead.

It can be either. Korean nouns usually do not show singular vs. plural unless the speaker wants to make it explicit.

So 유리 조각 could mean:

• a piece of glass
• glass pieces
• glass shards

You normally understand the number from context. If the speaker wants to be specific, they can add something like:

• 유리 조각 하나를 = one piece of glass
• 유리 조각들을 = glass pieces / the pieces of glass

Because Korean normally follows Subject-Object-Verb order, and the verb usually comes last.

In this sentence:

• 그 순간 = time expression
• 유리 조각을 = object
• 찾았습니다 = verb

So the structure is very normal for Korean. English puts the verb earlier, but Korean usually saves it for the end.

찾았습니다 is the past tense formal polite form of 찾다.

Breakdown:

• 찾- = verb stem
• -았- = past tense
• -습니다 = formal polite ending

So 찾았습니다 is a respectful, formal way to say found or looked for, depending on context.

Less formal versions would be:

• 찾았어요 = polite everyday speech
• 찾았어 = casual speech

This is a very common question, because 찾다 can be used in more than one way.

Depending on context, it can mean:

• to find
• to look for
• to seek

So 찾았습니다 by itself can sometimes be ambiguous.

In this sentence, if the intended meaning shown to the learner is found, then that is the correct interpretation here. But in another context, the same form could mean looked for.

For example:

• 열쇠를 찾았습니다 could mean I found the key or, in some contexts, I looked for the key
• Context usually makes the intended meaning clear

If you specifically want to emphasize one piece, then yes, 유리 조각 하나를 찾았습니다 is clearer.

But 유리 조각을 찾았습니다 is still natural. Korean often leaves the exact number unstated if it is not important or if the context already makes it clear.

So:

• 유리 조각을 찾았습니다 = found glass piece(s)
• 유리 조각 하나를 찾았습니다 = found one piece of glass

It sounds like narration or a factual report.

Because it uses 찾았습니다, it feels:

• polite
• somewhat formal
• suitable for storytelling, reporting, or explanation

It does not sound very casual. In everyday conversation with friends, a speaker would more likely say:

• 그 순간 유리 조각을 찾았어
• 그 순간 유리 조각을 찾았어요

So the grammar is completely normal, but the ending gives it a more formal tone.