What i m saying is we get the technologies which they own in there subs. Full IPR of sub may not not be with S.K. but some of its parts may n indigenous to S.K. Japs have full IP of their SSK, but no SSN. So even if S.K. are unable to give us anything we can approach Japs. Make our own JASKIN like AUKUS.A simple thing like hull of Minesweeper didn't work out when we found that original IPR of tech claimed domestic by South Korea was held by Italy actually.
Imagine what happens with Submarine?