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Regret.
Lu Tong had heard many poems about regret.
Lu Rou told her that regret means lamentation, helplessness, and remorse.
As a child, Lu Tong thought there were many such things, like when she accidentally shattered her most beloved porcelain doll, when she fought with Liu Zide's brothers for the last piece of candy on the mat, or when she missed the final night show at the temple fair because she was too busy catching fish...
In her noisy and bustling life, she was always filled with lamentation, helplessness, and remorse.
But in that moment, she finally understood the true meaning of regret.
Regret is not having the chance to say goodbye.
She later reflected countless times. Perhaps she could have left a note for her parents, or sent someone to relay a message. Why had she been so foolish not to adapt? If she had been as well-read as Lu Rou and Lu Qian, a bit smarter, maybe she would have thought of another way.
With each remembrance, her regret deepened.