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During the Warring States period, King Xiaocheng of Zhao, influenced by Qin's counter-espionage tactics, dismissed General Lian Po and appointed Zhao Kuo, who was known for only discussing warfare on paper.
In the Battle of Changping, Zhao suffered a devastating defeat, losing 450,000 soldiers.
Realizing his grave mistake, the King reinstated Lian Po.
Subsequently, many individuals who had previously severed ties with Lian Po when he fell out of favor now eagerly returned to seek his goodwill.
Lian Po, however, held these opportunistic people in contempt, clearly understanding the true nature of '市道之交' – relationships based purely on self-interest and convenience rather than genuine sentiment.

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Open the tool →市道之交 (shì dào zhī jiāo) is a Chinese idiom (chengyu) meaning “a relationship or friendship based on mutual benefit, personal gain, or convenience, often superficial and subject to change when interests shift; a mercenary friendship or fair-weather acquaintance”.
市道之交 is pronounced shì dào zhī jiāo in Mandarin Chinese.
Literally, 市道之交 means “market-path acquaintance; market street relationship”. It is used to mean “a relationship or friendship based on mutual benefit, personal gain, or convenience, often superficial and subject to change when interests shift; a mercenary friendship or fair-weather acquaintance”.
市道之交 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
指买卖双方之间的关系。比喻人与人之间以利害关系为转移的交情。