Heard about this drama only when netflix picked it up. Watched when airing and was hooked right from the first episode. The plot is unique. Though time travel plots are not uncommon but this is a cute timetravel drama with the cutest time traveler. In a way, its a healing drama. Everyone does some adventures in their teens, make some mistakes but some mistakes can have tragic consequences. The plot revolves around this. 1 mistake of 17 year old Bahn Ha Ni Completely changes her life, shatters her morale, will to live life the way she wants to. After 20 years 37 year old Bahn Ha Ni meets her 17 year old self unaware of the tradegy which changed her. They both together travel towards healing, moving on from their past and living life to the fullest. Alot of life lessons in every episode. Cast is Ordinary but still everyone did a good job. The young Ha Ni was very cute. The business part was cliche, quite boring, But not part of the main plot. Romance is almost nil and it suited the story. The chemistry between male and female lead is good. One thing which makes this drama different is the character of male lead. He is not a superhero who rescues the FL like in a typical cliche drama, but he walks with her and comforts her. Will definitely rewatch it whenever I feel down.