Because when you learn Japanese, you have to learn kanji, the more traditional strokes (non-simplified), both Japanese and Chinese sounds, and the grammar is closer to Korean (and closer pronunciation for a lot of words).
So, it's better to learn Japanese, quickly pick up Korean, then learn Chinese.
Chinese last since you have to learn simplified characters, the grammar is different, tonality is quite different, etc.
So, it's better to learn Japanese, quickly pick up Korean, then learn Chinese.
Chinese last since you have to learn simplified characters, the grammar is different, tonality is quite different, etc.