Baduk doctor ( https://www.youtube.com/@BadukDoctor) is a youtube channel by Park Young Woon, a Korean 7d amateur living in Hong Kong. He represented Hong Kong in a few amateur world championships. In his online channel he often plays and beats professionals from China or other countries.
Most of his videos today are rendition of streamed game play plus review. He used to create lessons for amateurs but nowadays these tend to be reserved for members of the channel. A few remaining series of interest are