Beom Jun Koo is a South Korean fourth-generation Unterganger who started making parodies in August 2015. He has 16 subscribers as of July 2016.
He first discovered Downfall parodies through a Korean parody of Hitler ranting about game hacks in 2011. After watching a few more parodies, he established his channel in February 2013. However, he did not make any parodies, despite his dreams to make them, until Charizard announced his DPMV contest.
Beom decided to enter the contest as his introduction to the Downfall community. However, his sub par video editing skills due to his lack of experience with computers netted him last place in the contest. This made him and his entry a running gag in the chat room. Despite this, Beom still carries on Unterganging even with a low profile, claiming that he does it for fun rather than attention. This is seen with his continued efforts in contests such as The "Spooky Hitler" Halloween Contest and the Winter Bunkerland Christmas Contest, and the low placings he got in them.
In July 2016, he announced a Q and A for his near one year anniversary of Unterganging.
On October 21, 2016, he released the third episode for Hitler Sends Göring to Africa's third season, which has since been retconned and was replaced by another episode made by F-A Alexander, who is now the creator of the entire season.
His parodies mainly consist of parodies made with Downfall parody creator. He also makes "recorded with camera" videos, because he cannot render his videos well, audio-based parodies, and "Beom Jun Koo sings" videos, in which Beom himself appears onscreen to sing random songs that he spoofed with Downfall parody material.
He began using Windows Movie Maker (though much of the footage he used are still camera-recorded) in October 2015.
He is also known to make many parodies about My Little Pony related topics.