Learn Hardcore Korean: wanchungjaewa baesongbireul gogaek senteo-e munuihaessseupnida. - I asked the customer service center about the cushioning material and shipping fee.

Breakdown of wanchungjaewa baesongbireul gogaek senteo-e munuihaessseupnida.

Why does 와 mean and here, and why is it 와 instead of 과?

와/과 is the noun-linking particle meaning and.

You choose between them based on the final sound of the noun before it:

Since 완충재 ends in the vowel sound ㅐ, it becomes 완충재와.

Examples:

Why is there only one 를 after 배송비, not after both nouns?

In Korean, when two nouns are joined with 와/과, the case particle often appears only once at the end of the whole noun phrase.

So:

The 를 applies to both nouns together.

This is like treating 완충재와 배송비 as one combined object:

You would not normally say:

Why is 고객 센터에 used? Why 에 instead of 에게?