Buy a Drinking the Water of a Well: One Should Never Forget Who Dug It calligraphy wall scroll here!
This proverb suggests that one should always be grateful to those who helped one succeed.
And remember your ancestors and those that came before you whose sacrifices made your present life better.
Some Chinese will separate the intended meaning from this proverb and translate this as “Don't forget the people who once helped you.” In Modern China, this idiom is virtually never used to refer to an actual well.
Note: This can be pronounced in Korean but it's not a commonly used phrase.