Yoon Yoonika. Her mom is the biggest fan of B2ST and Son Dongwoon. But her forever bias is Lee GiKwang. Theres a competition held by Cube Entertainment that is to write a new song for Reasts member. You can get to choose only one member to sing it. The prize is you get to be the member you choosed's personal assistant for 3 month in condition you are 18- 23 y/o. Yoonika dint really want to join as she dont even know how to write a song. But her mom eagerly wants her to join the competition. Her mom saw a bright future as she used to works as a song writter. Mom write a lovely song for Yoonika but she told her to pick Son Dongwoon. Yoonika dint want to but then she thought that she can still meet Gi Kwang even if she picks Dongwoon. And she agreed for choosing Dongwoon. She is so lucky that her moms song is so lovely and she wins. What will happend while she is working with dongwoon? Will she fall in love with Dongwoon or still with Lee Gikwang