The idiom originates from the classic novel *Water Margin*. After Song Jiang killed Yan Po'xi, he sought refuge with the wealthy Chai Jin, who treated him with great hospitality.

One night, after a late drinking session, Song Jiang went to the latrine and accidentally bumped into Wu Song, who, being in a bad mood, cursed loudly. Others present informed Wu Song that the man he was scolding was Song Jiang, Chai Jin's most distinguished guest. Upon hearing this, Wu Song sighed and exclaimed, 'People cannot enjoy good fortune for a thousand days, just as flowers cannot stay red for a hundred days!' This phrase implies that good times and personal favor are transient.

Later, Song Jiang and Wu Song were introduced properly by Chai Jin and became close friends.