Two friends. Jang Hyein and Kim Seokjin, people call him Jin. Bickering, shoving and teasing each other was their friendship. 
However, in year 4, Jin slowly realizes something more to Hyein. What could it be? 

Jang Hyein

Athletic and musical. Namjoon's best friend. Park Jimin and Jeon Jungkook's former love interest.

Kim Seokjin

Jin. Smart and musical. Yang Jeona's former pet.

Kim Namjoon

Smart and musical. Jang Hyein's best friend. Good friends with Kim Seokjin.
 

Min Yoongi

Musical and lazy. Kim Seokjin's best friend. Jang Jeona's former best friend.

Jeon Jungkook (Cameo)

Smart, musical and athletic. Attends a different school. Jang Hyein's former love interest.
 

Park Jimin (Cameo)

Athletic and smart. One of the people in Kim Seokjin's friend groups in year 1. Jang Hyein's former love interest. 

Jung Hoseok (Cameo)

Musical and loves dance. Bright and cheerful. One of the people in Kim Seokjin and Min Yoongi's friend group in year 4. 

Kim Taehyung (Cameo)

Known as the weird of year 4. One of the people in Kim Seokjin and Min Yoongi's friend group in year 4. 

Yang Jeona

Jang Hyein's friend and teammate. Kim Seokjin's former love interest.