The idiom '不打不成相识' (bù dǎ bù chéng xiāng shí) originates from a story in the classic Chinese novel 'Water Margin' (also known as 'Outlaws of the Marsh'). Song Jiang, having committed an offense, was exiled to Jiangzhou. There, he met two prominent figures of the jianghu (martial arts world), Dai Zong and Li Kui.

One day, the three went to a riverside tavern called Pipa Pavilion for drinks. Song Jiang expressed a desire for fresh fish soup. Li Kui, known for his impetuous nature, went to the fishing boats by the river to procure some. However, he got into a heated argument and a subsequent brawl with Zhang Shun, the boat owner, who was also a powerful fighter.

Dai Zong intervened to stop the fight. Afterward, the three of them went to see Song Jiang. Song Jiang, recognizing their valor and character, skillfully reconciled them. Through this initial conflict and subsequent understanding, Zhang Shun and Li Kui not only settled their dispute but also became close friends with each other and loyal followers of Song Jiang, proving the saying that sometimes, a good fight can lead to a deeper acquaintance and stronger bond.