suryeongini gyeongbisireseo mulgeoneul suryeonghaessseupnida.

이 is the subject marker. It marks 수령인 as the subject of the sentence.

• 수령인 = recipient / addressee / person receiving the item
• 수령인이 = the recipient (as the subject)

So 수령인이 경비실에서 물건을 수령했습니다 means that the recipient is the one who performed the action of receiving/picking up the item.

A learner might compare:

• 수령인이 = the recipient did it
• 수령인은 = as for the recipient, ... (topic-marked, with a slightly different nuance)

In this sentence, 이/가 simply identifies who received the package.

경비실 means guard office, security office, or concierge/security desk depending on the building.

에서 is used because it marks the place where an action happens.

• 경비실에서 = at/in the guard office
• The action of receiving the item happens there.

Why not 에?

• 에 is often used for destination, location of existence, or time
• 에서 is used for the location where an action takes place

So:

• 경비실에 = to the guard office / at the guard office (depending on context)
• 경비실에서 수령했습니다 = received it at the guard office

Because 수령하다 is an action, 에서 is the natural choice.

을/를 marks the direct object of the verb.

• 물건 = item / thing / package / belongings
• 물건을 = the item (the thing being received)

So in this sentence:

• 수령인이 = the subject
• 물건을 = the object
• 수령했습니다 = received / picked up

English relies mostly on word order, but Korean uses particles like 이/가 and 을/를 to show each noun’s role more clearly.

They are related words built from the same Sino-Korean root 수령.

• 수령인 = recipient
  
  • 인 means person
• 수령하다 = to receive, to collect, to pick up

So:

• 수령인 = the person who receives
• 수령하다 = the act of receiving

This kind of pattern is very common in Korean, especially in formal or administrative language.

Other examples of the same idea:

• 신청인 = applicant
• 신청하다 = to apply

So even though the words look repetitive in English, in Korean this is a normal formal style.

It is grammatically correct and sounds especially natural in a formal, written, administrative, or delivery-related context.

However, in everyday conversation, it can sound a bit stiff because of the repeated 수령.

A more casual version might be:

• 받는 사람이 경비실에서 물건을 받았습니다.
• 수취인이 경비실에서 물건을 찾아갔습니다.
• 받는 분이 경비실에서 물건을 수령하셨습니다. (more polite toward the recipient)

So the original sentence is fine, but it has a formal document/report tone, like something in a delivery log or building notice.

수령하다 is more formal and often suggests official receipt, pickup, or collection of something.

Compare:

• 받다 = to receive
  
  • very common, everyday word
• 수령하다 = to receive / collect / claim / pick up
  
  • more formal, administrative, official

Examples:

• 택배를 받았어요. = I received the package.
  
  • natural in everyday speech
• 택배를 수령했습니다. = I received/picked up the package.
  
  • more formal, like a notice, report, or log entry

So 수령했습니다 fits well if the sentence is about package pickup at a building security office.

수령했습니다 is the formal polite past tense of 수령하다.

Breakdown:

• 수령하다 = to receive
• 수령했- = received
• 습니다 = formal polite sentence ending

So 수령했습니다 means received or picked up in a polite/formal style.

This form is commonly used in:

• announcements
• reports
• customer service
• notices
• written records

It is less conversational than forms like:

• 수령했어요 = polite casual
• 수령했어 = plain/casual

Good question. 수령했습니다 is polite toward the listener/reader, but it is not honorific toward the subject.

If the speaker wants to show respect toward the recipient, they could say:

• 수령인이 경비실에서 물건을 수령하셨습니다.

Here, 시 is the honorific marker, making the verb respectful toward the subject.

Why might the original sentence avoid it?

1. It may be a neutral report, not focused on honoring the recipient.
2. In administrative writing, non-honorific formal style is often used.
3. The subject may not be someone the writer needs to honor.

So:

• 수령했습니다 = formal statement
• 수령하셨습니다 = formal statement + respect toward the subject

The basic Korean order is:

Subject + place + object + verb

So:

• 수령인이 = subject
• 경비실에서 = place where the action happens
• 물건을 = object
• 수령했습니다 = verb

Korean often puts the verb at the end. That is one of the biggest differences from English.

A very literal breakdown is:

• The recipient
• at the guard office
• the item
• received

Natural English rearranges this to:

• The recipient received the item at the guard office.

Yes. While 물건 literally means thing or item, in context it often refers to:

• a package
• a delivery
• belongings
• goods
• an object being picked up

In a sentence involving 경비실 and 수령하다, many learners would naturally interpret 물건 as something like:

• a parcel left with security
• a delivered package
• an item being held for pickup

So the exact English word depends on context. Item is safe and general, but package may sound more natural in many real-life situations.

Yes, the pronunciation changes a bit because of Korean sound rules.

수령인 is written:

• 수령 + 인

In actual pronunciation, it is commonly pronounced close to:

• 수령인 → 수령인 / roughly su-ryeong-in
• But because 령 is followed by 인, it can sound smoothly connected, almost like ryeongin

The important part for learners is that 령 is not pronounced like English r + y exactly. Korean ㄹ here is a Korean liquid sound, and 영 is like yuhng.

You do not need to overcomplicate it at first; just aim for something close to:

• su-ryeong-in

and listen to native audio when possible.

Yes. Korean often omits information that is clear from context.

For example, in a real situation people might say:

• 경비실에서 수령했습니다. = Received it at the guard office.
• 물건은 경비실에서 수령했습니다. = The item was received at the guard office.
• 수령인이 경비실에서 수령했습니다. = The recipient picked it up at the guard office.

Because Korean is highly context-driven, the subject or object can be dropped if everyone already knows what is being discussed.

The full sentence you were given is more explicit and is helpful for learners because all the roles are clearly marked.