Ryu Eun Jung seems like a normal woman, but she has candour in her personality that attracts people. Her best friend and lifelong rival is Cheon Sang Yeon. They first met during their elementary school days. Sang Yeon comes from a wealthy family background, and she is a talented person. Eun Jung was jealous of her, but they became best friends who sometimes hated each other the most. During their teens, 20s, and 30s, they would lose contact with each other and reconnect multiple times. Now, they are 42 years old. Eun Jung works as a drama series writer, and Sang Yeon works as a successful movie producer. One day, Sang Yeon suddenly appears in front of Eun Jung.