S.B and Y.C: The Legend Begins

S.B and Y.C are introduced as characters, and together, they each form their own defense units for the world, assigned by their regions: The Oceanic Defense Department (New World) and the Iron Wall Administration (Eurasia). Both units become rivals, and rising conflicts eventually lead to S.B and Y.C duking it out on the top of a building. The fight quickly ends when the building collapses, and the two reconcile for the moment.