Strong female/ male leads

The female lead is from a renowned family of doctors but one day she got tired of following the path her father wants for her so she put up her own clinuc in a small town and she met the neighborhood's butcher who teased her every chance he had. So I think The male lead is 4yrs younger too

Yes! Physically strong. The war is originally the fight between the light vs the dark army until the born of a right human being who is an E-rank runter, only an E-rank??? But you better read!