The Return of the Condor Heroes (1983)

Episode 44 (1x44)

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Xiaolongnu fights Gongsun Zhi to get the antidote for Yang Guo, but Yang Guo throws it to the bottom of the Passionless Valley because it's not enough for both of them. Huang Rong talks Xiaolongnu into convincing Yang Guo to take Heartbreak Grass to cure himself. Xiaolongnu then writes a note to Yang Guo to meet her in 16 years, then disappears.