Joo Eun Kyu, known professionally as Joo PD and formerly known as Sinsaimdang, is a South Korean online content creator who specializes in finance. He worked as an ordinary office worker at a professional financial tech company who in one year gained huge popularity after opening his YouTube channel and earning over 100 times what he used to earn as an office worker. He became an expert and now, through his "Class 101" videos, takes unskilled people and educates them to create various profitable YouTube channels. He showcased his expertise on TV for the first time during an episode of "You Quiz on the Block 3" in 2020. He originally was known as Sinsaimdang, a name from a literary woman from the Joseon dynasty, but decided to change his stage name to Joo PD.

(Source: Korean = Naver || Translation = kisskh) Edit Biography