Melancholy and resentment, which here refers to a sense of helplessness found in poems, is one of the 24 poetic styles summarized by Sikong Tu, a poet in the late Tang Dynasty
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榴莲芝心饼
Melancholy is a deep and lingering sadness, like a heavy fog that clouds the mind and dampens spirits. Resentment is a bitter feeling of anger and bitterness towards someone or something, often arising from a sense of being wronged or treated unfairly. When intertwined, they create a complex emotional state of sorrow and indignation that can be hard to shake off.