Lady Kang Hyewon is very protective to her only daughter Kang Wonyoung to the point that she'd go to wherever her daughter goes and act as the chaperone and driver, even going to Wonyoung and Yujin's dates. She also loves to spoil her by giving luxurious and expensive gifts just to make sure she is happy. However when cool kid An Yujin came it made Hyewon felt threatened though she knows someday her baby will be taken away from her. Hyewon wants to be with Wonyoung all the time as she still blames herself that she failed to protect the love of her life Eunbi from an accident years ago and doesn't want the same fate would happen to her daughter as she is the only one left to her from Eunbi. Will Yujin be able to gain Hyewon's trust and prove to her that she can protect Wonyoung?