Introduction to the sour bean tree: The sour bean tree, also known as the "sour bean tree", is located on the south side of the front yard of Sun Yat-sen's former residence. It is said that in 1883, Sun Yat-sen brought the tree species back from Honolulu and planted it here. Around 1931, the tree was knocked down by a typhoon, but it still grew tenaciously, with lush branches and leaves.