While Yuna is cleaning the frontyard, she saw a small box infront of her house.

6 friends. Their love is like a cycle. Sinb liking Yuju Yuju liking Yerin Yerin liking Umji Umji liking Eunha Eunha liking Sowon And lastly, Sowon liking Sinb All of them kept it as a secret to theirselves...ye  

Yuju found a mysterious book floating in front of her. What does the book do to anyone who reads it?   Yuju has a lot of friends but instead she wanted to be alone. She doesn't want anyone beside her or being with her together. But will her heart change when she will also meet someone who is just like her?  

When Yuju closes her eyes, bad scenarios are seen. It has been hunting her every time she goes to bed and sleep.  

They say... that whoever are born in 1997 will experience an unrequited love.