gomujanggabe piga boyeossseupnida.

고무장갑 is a compound noun:

• 고무 = rubber
• 장갑 = gloves

So it literally means rubber gloves. In Korean, compound nouns like this are very common and are often written as a single word.

Also, Korean nouns usually do not show singular vs. plural unless needed, so 고무장갑 can mean:

• a rubber glove
• rubber gloves

The exact number depends on context.

Here, 에 marks the place or surface where something is found or appears.

So 고무장갑에 피가 보였습니다 means something like:

• blood was visible on the rubber glove(s)
• blood appeared on the rubber glove(s)

In English, we often say on, but Korean often uses 에 for a location broadly, including surfaces.

You can think of 고무장갑에 as on the rubber glove(s) or in/at the rubber glove area, depending on context.

This is because 보였습니다 here comes from 보이다, which often means to be seen or to be visible, rather than to see.

So the sentence is structured more like:

• Blood was visible on the rubber gloves
• Blood appeared on the rubber gloves

In that kind of structure, 피 is the thing that is visible, so it takes the subject marker 가.

Compare:

• 피를 봤습니다 = I saw blood
• 피가 보였습니다 = blood was seen / blood was visible

That is the key difference.

Not exactly.

보였습니다 comes from 보이다.

• 보다 = to see
• 보이다 = to be seen, to be visible; sometimes also to show

In this sentence, 보였습니다 means was visible or was seen.

So:

• 피를 봤습니다 = I saw blood

  • more direct
  • focuses on the person seeing it

• 피가 보였습니다 = blood was visible / blood appeared

  • sounds more indirect or observational
  • focuses on what came into view

This makes 보였습니다 feel a little more neutral or descriptive.

It can correspond to both in English, but the Korean wording is closer to:

• Blood was visible on the rubber gloves
• There was blood visible on the rubber gloves
• Blood appeared on the rubber gloves

English often prefers I saw blood on the rubber gloves, but Korean does not need to mention the observer if it is obvious or unimportant.

So the Korean sentence sounds less personal and more like a report of what was noticed.

Korean often leaves out subjects when they are obvious from context.

If you say:

• 고무장갑에 피가 보였습니다

it is usually understood that someone noticed it, often I or we, depending on the situation.

Korean does this very naturally. Adding 제가 is possible, but it changes the focus slightly:

• 제가 고무장갑에 피가 보였습니다 is awkward as written
• if you want to emphasize the observer, you would more naturally say something like
  제가 고무장갑에 피를 봤습니다 = I saw blood on the rubber gloves

So with 보였습니다, the sentence naturally focuses on the blood being visible, not on who saw it.

Usually 에 is the better choice here.

• 에 = location, destination, surface, point where something exists or appears
• 에서 = location where an action takes place, or starting point in some uses

Since 피가 보였습니다 is about blood being visible at/on a location, 에 fits well.

So:

• 고무장갑에 피가 보였습니다 = natural

Using 에서 would sound less natural in this sentence because it makes the location sound more like the place where an action is happening, rather than the surface where something is visible.

Good question. Compare these:

• 고무장갑에 피가 있었습니다
  = There was blood on the rubber gloves.

• 고무장갑에 피가 보였습니다
  = Blood was visible on the rubber gloves. / I noticed blood on the rubber gloves.

있었습니다 simply states existence.
보였습니다 adds the idea that it was visually noticeable.

So 보였습니다 can feel a bit more like:

• it came into view
• someone noticed it
• it stood out enough to be seen

보였습니다 is in the formal polite style, often called -습니다 style.

This style is commonly used in:

• reports
• formal conversation
• news-like narration
• speaking politely to someone you do not know well

The base verb is 보이다, and the past formal polite form is 보였습니다.

A less formal polite version would be:

• 보였어요

So:

• 고무장갑에 피가 보였어요 = polite, everyday
• 고무장갑에 피가 보였습니다 = more formal/polite

Korean does not use articles like a, an, or the.

So 피 just means blood, and the exact English article depends on context:

• There was blood on the rubber gloves
• I saw blood on the rubber gloves
• The blood was visible on the rubber gloves
  only if the blood has already been identified in context

Also, 피 is usually treated like an uncountable noun, just like blood in English.

A natural pronunciation is approximately:

• 고무장가베 피가 보였습니다

A few sound changes happen:

• 장갑에 often sounds like 장가베
• the final ㅂ in 갑 links into the following 에

So although it is written 고무장갑에, in actual speech it often sounds smoother and more connected.

A rough step-by-step:

• 고무장갑에
• → 고무장가베

This kind of linking is very common in Korean pronunciation.