This paper focuses on proposing development plan by separating essential integration realm and possible independent realm between the South and the North area after the reunification of the Korean Peninsula. It is desirable that interest rate policy, and monetary policy, and the currency should be integrated in the end after sustaining the temporary separation. It will be fitted for the identity of the reunified state that the financial institutions including central bank, policy banks, and financial regulatory system should be also unified after the transitory separation. However, it is suitable that financial market should be recognized as market. In case the market is integrated artificially, there would happen great side effects. Instead, it can create synergy effects to develop the two treks between the South and the North. It would be desirable that state-owned banks be responsible for the loans for the state-owned companies in the North after the reunification. It is necessary that securities market representing capital market be also separated and operated.