https://www.youtube.com/@imamuroom She used to do a lot of bento boxes but has since switched to regular home cooking. Good for getting meal inspirations.
https://www.youtube.com/@AcreHomestead She does a lot of "meal prep" style videos and food preservation, including lots of freezer meals. Also good for inspiration.
https://www.youtube.com/@Doobydobap She has a few long-ish videos that give a good high level overview of Korean cooking. The majority of the channel is more vlog-like but I've only watched her cooking videos.
https://www.youtube.com/@CSaffitz Mostly does desserts. Her recipes tend to be on the more complex side. I'd look to her if I really want to perfect a recipe.