Yes, income you win with any on the internet must be integrated on your annual taxes. https://fxflare.kr/%EC%B5%9C%EA%B3%A0%EC%9D%98-%ED%86%A0%ED%86%A0-%EB%B6%84%EC%84%9D-%EB%AC%B4%EB%A3%8C-%EC%82%AC%EC%9D%B4%ED%8A%B8-%EC%8A%88%EC%96%B4%EB%A7%A8%EC%9C%BC%EB%A1%9C-%EB%A8%B9%ED%8A%80%EA%B2%80%EC%A6%9D/