Another commented: "Tears keep on running from my eyes because I'm so proud of Ai Bao! Well done, Ai Bao!"
Ai Bao and Le Bao, the father, arrived in South Korea in 2016 as a state gift from Chinese President Xi Jinping.
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China has long deployed "panda diplomacy", gifting the animals to various countries, often to further its foreign policy aims.
Beijing only loans pandas to foreign zoos, which must usually return any offspring within a few years of their birth to join the country's breeding programme.