Unwavering loyalty and devotion, often to a noble cause or principle, with a pure and sincere heart.
他一生为教育事业奉献，碧血丹心，是所有学生的榜样。
He dedicated his life to education, showing profound loyalty and a pure heart, serving as a role model for all students.
Era:
Ancient
Frequency:
Story:
During the Zhou Dynasty, Chang Hong, a high-ranking official under Duke Liu Wen, remained loyal to the court throughout his life. He was neither humble nor arrogant, possessing a spirit of integrity. Due to his uprightness, he offended influential figures in the court and was unjustly executed by the Zhou people.
Legend has it that at the time of his execution, someone, admiring his character, collected his blood and hid it at home. Three years later, all the dried blood clots transformed into green jade.
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