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According to an ancient legend, Weisheng was a man renowned for his unwavering commitment to promises. One day, he arranged to meet his beloved under a bridge.
The woman did not arrive as scheduled. Suddenly, a torrential rain began, causing the river to swell. The water level rose steadily, first reaching his waist, then his chest.
Despite the imminent danger, Weisheng steadfastly refused to abandon his post, determined to keep his word. Tragically, he drowned in the rising floodwaters, a testament to his rigid adherence to a promise.

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Open the tool →尾生之信 (wěi shēng zhī xìn) is a Chinese idiom (chengyu) meaning “Blindly adhering to a promise or agreement, even when it leads to severe personal harm or loss, without considering practical consequences or alternative solutions; rigid and unthinking faithfulness”.
尾生之信 is pronounced wěi shēng zhī xìn in Mandarin Chinese.
Literally, 尾生之信 means “Weisheng's faithfulness”. It is used to mean “Blindly adhering to a promise or agreement, even when it leads to severe personal harm or loss, without considering practical consequences or alternative solutions; rigid and unthinking faithfulness”.
尾生之信 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
尾生:古代传说中坚守信约的人,他为守约而甘心淹死。比喻只知道守约,而不懂得权衡利害关系。