The national team's fullback depth isn't bad; it's fine except for the defensive midfielders

Left fullbacks: Cho Hyun-taek, Kim Tae-hyun, Bae Hyun-seo, Kim Seo-jin
Right fullbacks: Seol Young-woo, Choi Jun, Choi Seok-hyun, Hwang Moon-gi
I think this level of fullback depth is decent
The defensive midfielders are the problem, but I don't think the fullbacks are a weak link at this level