In recent years, OTT TV (Over The Top Television) has flourished, and gradually began to focus on the user-centered. It is very important to provide a good and smooth experience for the user. This study uses semi-structured interviews to explore the process of finding drama in LINE TV application, the usability issues, the selection factors that attract users finding drama and the function of triggering users to click the drama. Finally, the researchers summarized the data by protocol analysis. The main findings of this study are as follows: (1) LINE TV uses a white substrate color to make it feel simple and refreshing. The icon design of the home button is intuitive, easy to understand, and not easy to get lost. (2) User does not trust the recommended drama section in the ＂Top Banner＂ page of the homepage, which loses the function of the area; The layout of the seven ＂Recommended Classification of Drama＂ are too similar, causing users to lose patience with the same visual arrangement, which loses the function of this position; The meaning of the words ＂changing a batch of sheets＂ button is not clear; too subjective copywriting makes users have doubts and negative comments when viewing the project; The drama category lacks the ＂story category＂ option to categorize. (3) The beauty and theme of the poster are the attracting factors, but the rating is the driving factor. (4) The ＂Last Watch＂ function is the reason that triggers the user to click on the drama.