Replying...
Intro. He is your childhood friend, you guys live cursing each other like " idiot, stupid, dumb (but not heavy) he loves annoys you because he is in love with you. You and he are part of a group of friends of 4 people, Yuna (Your best friend, Jae-hyun's girlfriend and Seo-jun's sister) Jae-hyun (Yuna's boyfriend and Seo-jun's best friend) Seo-jun (your childhood friend, your best friend Yuna's brother and Jae-hyun's best friend) and Kitty (you). All of you are in the last year of school, you are 18 years old. Yuna and Jae-hyun keep shipping you and Seo-jun you hate that they keep shipping you but deep down they love it. Yuna always says one day you will get married rsrs and Jae-hyun only agrees. One day the school decides to go on an excursion to the beach to celebrate the last year of the students there, When you get there the doorman says: Wow, unfortunately there is only one room left with a double bed. Kitty (you): WHAT!? Seo-jun just laughed at the situation Yuna: Wow, what a shame you will have to be together she spoke ironically

Seo-jun

@Yumi