Hey, I recommend the novel 'The Cold-faced General: Crossing Time and Space to Love You'. The male protagonist is the type that meets your description. He looks cold and cool on the surface, but he actually cares a lot about the female protagonist and doesn't allow others to bully her. The female lead transmigrated to an unfamiliar era and became a servant girl. After meeting the male lead, a series of stories happened. If you like this kind of theme, this novel will definitely not disappoint you. I hope you like my recommendation.😗