Webcomic has become subculture within comic medium. It still has the same visual elements with printed comic but has its own set of rules and presentation which contrasted from printed comic. South Korean webcomics, famously known as webtoon, are more adapt to digital and online media characteristic. It is show in the way they explore webcomic's vertical infinite canvas. However, each webcomic is unique and has its artist's idiolect. This paper breaks down visual patterns of a webcomic entitled "The Secret of Angel" (TSoA) in order to see the artist's idiolect, the way it exploits infinite canvas and how it stands out. Method use is qualitative descriptive, with 6 episodes of TSoA as samples. Findings indicate that TSoA is adapt to media convergence and the use of vertical infinite canvas and its latest episodes has shown maturity in using the verticality. However, TSoA still maintain its own artist's idiolect such as no speech balloons are inside panels, and longer and wider gutter.