What does Yun Hong's Garden represent?

Yun Hong's imaginary garden symbolized a peaceful place where she could escape from the harsh realities of the Japanese prison camp. Ling helped create the imaginary garden and used it herself as a means of escape. Ling later felt the need to actually create the garden as a way of honoring Yun Hong, but she was not able to do so until she returned to Yugiri after her retirement.