민수 씨, 정말 감사합니다. 오늘부터 많이 노력하겠어요. 틀림없이 한국말을 잘 해요. 글을 고치셔서 갑사합니다.

“Cheer up, I'm on your side. I’ll cheer you up. Fighting!” I think you mean that, right? But in English we don’t say “fighting” in order to cheer someone up, we’d probably say “you can do it” or “it’ll be okay”.