“B” is an actress who lives in the “mirror world”. Her job is to perform as the mirroring of “Da Hong”, who lives in the “real world” and has the same appearance of her. One day, B accidentally finds out that if “Da Hong” dies, she would also disappear, forever. Desperately and daredevil, “B” rushes out of the mirror and successfully goes to the real world. Only if she can turn the boyfriend of Da Hong’s heart back, can she prevent Da Hong’s suicide. However, as she conducting this mission and playing the role of “Da Hong” in the real world, she falls in love with this strange yet familiar man.