Now that I think about it, there have been other times where christianity spread suddenly in East Asia. Namely during the Taiping Rebellion in China (mid 1800s), and during the sengoku Jidai in Japan.
From what I can see, Christianity manages to tap into a cultish millenarian tradition that's present in many east asian peasant communities, that's usually channeled more towards buddhism (like the white lotus sect in China, and Ikko ikki in Japan). Some christian denominations in Korea are admittedly a bit cultish (namely the moonies).
I don't see many direct ties between those christian incidents and korea's recent growth in christianity, though.
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