“Members of the Christian sect linked to a cluster of coronavirus cases in South Korea held meetings in Wuhan until December, only stopping when they realised that their community had been hit by Covid-19, the previously unknown disease caused by the virus”
BTW, that quote was from https://www.scmp.com/news/china/politics/article/3052322/coronavirus-secretive-south-korean-church-linked-outbreak-held
I heard they also recently had a communion service, which would help explain why it spread so quick.