The discussion about our reincarnated next life and also our previous life is one that's never-ending. Physicist from all over the world and all over timeline take an interest in the topic.

 However, to no avail, there is no proof and it's only consider as a myth or in some religion it's a belief that once a human died, their soul will be reincarnated into another body. 

 What if, one fateful day, a day where Kim Taeyeon, a 22 years old college student with awful lot of debts meet someone similar to her in term of physical, visual but not personality. 

 And that person declare herself as Kim Taeyeon from her past life.