Shincheonji
The Shincheonji Church of Jesus, established in 1984 by Lee Man-hee, is dedicated to the idea that only Lee Man-hee can bring Jesus Christ back to life and that only through him may believers avoid damnation. They have embraced such ideologies as the notion that getting sick is a sin because it prevents a believer from being able to preach the gospel as they have grown to be one of the biggest and most extremist doomsday cults in South Korea.
In February 2020, this cult briefly became well-known on a global scale. They were the perfect superspreaders of the then-emerging Covid-19 pandemic because of their relentless services in incredibly crowded rooms and their exceedingly active preaching. One of the first major cities in South Korea to be affected, Deenghu, was said to have experienced a personal spread of around 75% of all cases by one devotee identified as Patient 31. They have thus far gotten the closest to bringing it about of all the doomsday cults in the globe.