The Korean site was selling lossless sound sources of the cover photos below.
It seems like some EP from the King Records era among discography.
First of all, I organized only the cover photos, and then occasionally buy and listen to them one by one.
44 EP covers: https://mega.nz/file/sgYwnLpb#Y9 ... P9zN0GGmEsHE8M4igcU