Möbius band is a looped surface with only one side and only one edge. As long as you start on the same side, you will always meet. Eunbi is tasked to spy on her new boss, who is a rival of the man who saved her life. Except that new boss is Miyawaki Sakura, her first crush and hoobae from high school, who also ghosted her 7 years ago...

Am I a thinker who talks about my dreams, or an observer who hesitates? Sakura finds herself ed into a new reality of living with her stepsister after both of their parents passed away sucessively following a whirlwind, cross-country marriage. As she finds a new family in Korea, will she able to confront her growing feelings for Eunbi? How will both of them deal with their dreams, and will their pasts come back to haunt them? A story the forbidden love between sisters, and the choice be