Honest John rocket, inherited from US Army, there is rumor that it is fitted with guidance system by SK. Unknown whether it is withdrawn from service.
Hyunmoo I & II - while Nike Hercules is dual role missile, the Korean version is throughly modified that it can be argued as wholly different weapon. It is fitted with different rocket motor than Nike Hercules, fitted with cluster warhead and British guidance system. Early version had range of 180 KM, but Korean cladestinely developed 300 km version. In total SK has about 300 of them.
Korea developed the cruise missile also cladestinely with reports coming in early as mid 90s. Eventually US relent and approve of CM development. When it was first announced, the Hyunmoo IIIA had range of 500km, but when NK were making saber rattling posture, MND also announced that it already developed 1000 km version and is working on 1500 km version.
South Korea military tend to report to the world its new system only after it is deployed.
To properly coordinate its SSM asset, MND created Missile Command to oversee its offensive capability. As a reminder this is not missile defense as some people has confused with.