Myoui Mina a 34 years old widow business woman from States visits Korea for her best friend's Park Jihyo's wedding.
Unexpectedly she'll meet her bestfriends twin daughters who'll turn her life around.
Chaeyoung and her best friend have been friends for over ten years. Chaeyoungs life change after a single night, she falls in love with her best friend sister shortly after. Her best friends sister has many difficulties. Can she help her? Did her life change for better or worse?
-The 2nd book to the story is High School Sweethearts-