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In the late Warring States period, Jing Ke (also known as Qing Qing from the state of Wey) traveled around, advocating for the six states to resist Qin.
After being disdained by Zhao, he went to the state of Yan, where he befriended Gao Jianli, a musician. They shared similar interests and often drank and sang together. When they were in high spirits, they would sometimes burst into laughter, sometimes weep bitterly, as if only the two of them existed in the world and no one else was present.
Later, under the introduction of Tian Guang, Crown Prince Dan of Yan persuaded Jing Ke to assassinate the King of Qin, but neither of them succeeded in their mission.