It is Lone Star Singing Alone. "Lone Star Singing Alone" was originally an erhu performance piece. Nowadays, the erhu, dongxiao and piano versions are widely circulated on the Internet. In the TV series "Feng Yun Xiong Dominates the World", when Xiong Ba was defeated by Feng Yun, he fled to Zhonghua Pavilion, and that place was the residence of the unknown senior. Wuming wanted to influence Xiong Ba, so he played the song "The Lone Star Sings Alone" on the erhu where Xiong Ba appeared.

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