Vanishing Twin

Yeon Janghwa is a more or less average college student: she attends a pretty good university, is pretty good-looking, and has a nice boyfriend. Her twin sister, Hong-ryeon, on the other hand, is the opposite. Being the good sister she is, Janghwa sets out to help her twin sister... but at what price? The truth is in the details.

(Source: Lezhin)