Everything is unfamiliar to me. Would you help me remember?

Yoo Jeongyeon babysits her cousins who happens wanted to go to an amusement park. At the rollercoaster, there she meets her seated buddy named Myoui Mina.

Honda Hitomi is kind, mature, and wise beyond her years. Unfortunately her efforts were never recognized. Not until a self-proclaimed admirer of Hitomi, hides with a name of "KC". Somehow the admirer manages to break into the broadcasting room to sing her a song. Also, the Student Council secretary - Kim Chaewon. Known for her cold exterior and character, visits the bakery where she works on, revealing an unthinkable personality.

Lee Chayeon went to a lot of struggles as a trainee, who just dreams on becoming an idol. On her third survival show - Produce 48, there she meets Miyawaki Sakura who helped her throughout the show that brought her immense pressure. That also includes Miyawaki Sakura who is a Japanese idol just trying her best surviving in a new environment.