Lee Seul Bi (Kim Min Young) has a huge crush on her boss Lim Hyun Woo (Yong Junhyung). One day, she drinks a cup of magical coffee that changes her appearance! Lee Seul Bi introduces herself as Oh Go Woon (Chae Seo Jin), a close friend of Lee Seul Bi and goes to work instead. Lim Hyun Woo knows that these two women look nothing alike, but he can't shake the feeling Oh Go Woon reminds him of Lee Seul Bi. Will Lee Seul Bi be able to keep her secret before her crush finds out the truth? "Coffee, Do Me a Favor" is a 2018 Viki Original South Korean drama series directed by Park Soo Chul.