Not actually. They already produces and uses their own ship and sub-launched AShM, cruise missile, SAM, Anti-sub missile and torpedo. Their medium range KM-SAM can be launched from their Daegu class frigate which is based on Russian S-350. It has a range of 40 km like the Chinese LY-80A.
And like the BNS BB we can get a modified frigate with European armament and sensors from S.Korea as Thai navy and PN did. Last time S.Korea participated in BN's new corvette program they offered Umkhonto SAM with their design.
Aegis and the SM-series sam are wet dream.
Forget about those.
And those speculations about BN's future frigate are just BD Military's report, nothing's confirmed yet.