The beautiful Yurim Lee harbors a secret: she can sense when people are concealing dark intentions. To her, their faces seem shrouded in a black cloud. The darker the cloud, the more villainous their thoughts. However, this power has caused her more harm than good, leading to her ostracization during her youth. Now in college, she is a loner who struggles to trust others. One day, while walking home, Yurim is assaulted by a man covered in darkness. She is soon rescued by Jooeun Lim, a man with hair the color of cherry blossoms. Their brief encounter brightens her lonely world ever so slightly, and the two become friends. With Jooeun's help, Yurim copes with her unique ability and begins to meet new people. As she seeks to regain the trust in others that she lost, she must face a past which she has tried to forget.