Multipurpose synchrotron construction project (Korea-4GSR) has been carried out in Korea. The technical design for the Korea-4GSR had been completed and the project will be completed in 2029. The Korea-4GSR has 28 super periodic hybrid 7 bend achromat cells and in order to realize the worldwide competitive photon beam in 10~30 keV photon beam energy range with 800-m circumference ring, its beam parameters are 4-GeV beam energy, 400-mA beam current, and 62-pm beam emittance considering well-proven technology. In this talk, the Korea-4GSR project will be overviewed and discussed.