This is the 5332nd most frequent Korean word.
돈으로
"With money" or "by money."
The word '돈으로' here indicates the means or instrument used to purchase food, emphasizing its tool-like nature in the transaction.
나는 돈으로 음식을 사요.
I buy food with money.
In this sentence, '돈으로' is used to indicate the theoretical means attempted to achieve happiness, pointing out its futility in this context.
돈으로 행복을 살 수 없어요.
You cannot buy happiness with money.
Here, '돈으로' describes the composition or filling of the bag, showing a characteristic or state related to money.