Learn Hardcore Korean: yeongsujeungeun gyesan hue seorabe bogwanhaeyo. - I keep the receipt in the drawer after paying.

영수증 means “receipt.” The particle 은 is the topic marker attached to nouns ending in a consonant. It tells us that “the receipt” is what the sentence is about.

If the noun ended in a vowel, we’d use 는 instead.
가 (or 이) marks the subject, not the topic, so 은 is more natural here.

What does 계산 후에 mean, and why use 후에 rather than 이후 or 계산한 후에?

계산 is the Sino-Korean word for “payment.”
후(後) means “after,” and -에 makes it “after ~.”
So 계산 후에 = “after payment.”
Alternatives:
• 계산한 후에 (using the verb form) is equally correct and common in spoken Korean.
• 이후 is more formal and often found in written language.

Why is the location marker 에 used in 서랍에 보관해요 instead of 에서 or 안에?

-에 indicates the location where something is placed or stored.
서랍 means “drawer,” so 서랍에 보관해요 = “store it in the drawer.”
서랍에서 would mean “from the drawer,” showing the source.
서랍 안에 (“inside the drawer”) is grammatically fine but more wordy; native speakers usually say 서랍에.

What is 보관해요, and how is it formed?

The base verb 보관하다 means “to keep,” “to store,” or “to preserve.”
To make it polite-present:
1. Drop -다 → 보관하-
2. Add -아요/어요 → 보관해요
  Result: 보관해요 = “(I/we) store (it).”

Why does the sentence end with -요?

The ending -요 marks the polite speech level (해요체). It’s used in everyday conversation with people who are not super close to you. In more formal situations or on official signs, you might see 보관합니다 instead.

Could I reorder the sentence to 계산 후에 영수증을 서랍에 보관해요? What changes?

Yes. Korean has flexible word order.

영수증은 계산 후에 서랍에 보관해요 uses 은 (topic).
계산 후에 영수증을 서랍에 보관해요 uses 을 (object), shifting the emphasis to the action rather than the topic. Both are correct and mean essentially the same thing.

How would you say this more casually to a friend?

Drop the polite -요 and you can even substitute a more colloquial verb:
• 영수증은 계산하고 나서 서랍에 넣어 둬.
• Or simply: 영수증 계산 끝나면 서랍에 넣어.