Who wrote the couplet "Lotus with four walls and three willows, half pond and one well with autumn water" on the pavilion around the lotus wind?

"Four-walled lotus flowers are surrounded by willows on three sides, and half a pool of autumn water is a well." This couplet is a copy of Xiao Canglang Pavilion in Daming Lake, Jinan, Shandong Province. This was written by Liu, a famous scholar in Qing Dynasty. This couplet in Humble Administrator's Garden skillfully shows the four seasons that can be seen here, telling the four seasons of spring, summer, autumn and winter.