Your mum arranged a small vacation for you to have a summer vacation at your hometown, Jeju with your best friend Hyeri. You do love summer but you will always stick with your best friend for the whole summer trip and never have a guy flirt with you or even to know a guy friend. Seoul to Jeju, 1 hour for flight, 3 hours for train. 

''Mum, why do you always arrange a summer trip every year?'' you sighed.

''I thought you love it and you can know new guy you know.'' she wiggle her eyebrow. 

''Not ready for any relationship though.'' you walked away from your mum. 

''Well even if not, just be friends and the relationship can start from friends to boyfriend plus you will never know.'' she grinned.

''Okay then.'' she cheered. 

You, 19

Chinese Name: Zhang Yi Xuan                                                                                                                                       

Hangul Name: Zhang Yu Hae

You were mixed blood (like obvious, chinese+korean). 

Can't really speak Chinese well since you were born in Korea. 

You never have a boyfriend, even your mum wish for so much.

Him, 19 

Hangul Name: Oh Se Hun

Lived in Jeju and help out his dad at the bar during summer vacation. 

Her, 19

Hangul Name: Kim Hyeri

Your best friend. Always follow you to the summer vacation and make out with random guys. 

Pretty and flirty while losing her ity at 15 years old. 

He, 22

Chinese Name: Zhang Yi Xing

Hangul Name: Zhang Yu Xing 

Your brother, who always support you and be by your side whenever you need him.

He's always the over-protective brother who love you more than anyone else.