Korean government has been pushing the policy to lower the expensive toll on the private highways that has caused continuous complaints from the society because of relatively more expensive toll than that of the national highway which is managed by Korea Expressway Corporation(KEC). In Korea, seventeen private highways are under operation as of September, 2017. The average toll of the private highways is 1.51 times higher than that of the national highways. In the Ilsan-Toegyewon section(36.3 km) of the Seoul Outer Ring Highway which is composed of the northern private highway section and the southern national highway section, the toll discount was applied maximum 33% since March 29, 2018. With the application of this toll discount policy, the toll of Ilsan-Toegyewon section was lowered from 1.71 times to 1.1 times compared to that of southern national highway section in Seoul Outer Ring Highway. The applied business restructuring model to lower the toll on Ilsan-Toegyewon section this time is based on the combining the extension of operating period for another 20 years and the replacement of investors. It is reported that Korean government will continue to apply the business restructuring model to lower the toll on the private highways and promoting the benefit of public. If the KEC is participated in this type of business restructuring model as a new investor, the toll of private highway will be lower than the case of new private investor participating, due to lower borrowing rate of KEC.