Both high-resolution uniform grid and variable resolution grid on the cubed sphere are introduced to better represent weather process over Korean Peninsula and neighboring regions, and will be adopted to the existing non-hydrostatic dynamic core using spectral element method. The sub-grid scale physics will be upgraded to meet with the varying grid spacing ranging from 12km down to 1km, covering the grey zone. To extend the predictability up to 30 days in advance, the model will be coupled with various earth system components including land surface, ocean, sea ice, and chemical processes. Software engineering includes parallelization of codes, couplers, workflow management in the supercomputer environment.