this is surprising good. i need more chapters

anyway, a lil bit confuse why this is a webtoon while the name is japanese

Web cartoon = Webtoon. Another name is web comic. Webtoon more popular since its the most famous one Made by Naver comic (which is Korean).
Its about the format when you scroll down to read.
Japanese manga kinda "late" to adapt this format since they love flip the book more than scroll over