SM ELITE HIGH
- A school which only the rich could afford to go.
- 4 'classes' of students in the school:
  Level 1: Those who would inherit the company
  (Jongin, Kris, Baekhyun, Luhan, Lay, Chen, Suho, D.O and Eunsang)
  Level 2: Those who would inherit the stocks/assets
  (Chanyeol, Sehun, Tao, Xiumin and Minah)
  Level 3: Those who would inherit take over parents' job (e.g. Lawyer, Doctor etc)
  (Bomi and Hyori)
  Level 4: Those who received help from rich in order to study there
  (Hyeri, Jiyeon, Minrae and Hyomin)

Choi Hyemin
- 17 years old
- Student of a neighborhood girls' school
- Childhood friend of Kai, Luqing and Luhan

Luqing
- 18 years old
- Younger sister of Luhan
- Born in China, migrated to Korea at age of 3.
- Childhood friend of Hyemin
- Student of a neighborhood girls' school

Song Naeun
- 17 years old
- Close friend with Minji

Lee Minji
- 17 years old
- With music family background
- Loves singing but has no confidence
- Scouted by Lay
- Close friend with Naeun

Cha Eunsang
- 18 year old
- Literature club member of SM Elite High
- Class president

Cho Minah
- 17 years old
- Had to enter SM Elite High and join the Tennis club due to her father losing a bet to his friend (school's headmaster)

Yoon Bomi
- 18 years old
- Vice school president of SM Elite High
- Childhood friend of Suho and Hyori
- Always competing with Suho

Lee Hyori
- 17 years old
- Performing arts club member of SM Elite High
- Childhood friend of Bomi

Kim Hyeri
- 17 years old
- Entered SM Elite High through scholarship
- Have a few part-time jobs
- Orphan with no siblings
- Close friends with Hyomin and Minrae

Park Jiyeon
- 17 years old
- Lost her memories at age of 6
- Childhood friend of Chen

Lee Hyomin
- 17 years old
- Born in China, migrated at age of 14
- Childhood friend of Tao
- President of Wushu club of SM Elite High

Kwon Minrae
- 18 years old
- Offered to study at SM Elite High with a condition
- Track and Field club member of SM Elite High