Jae Hyun:

Age: 17

Profession: Student

Background: Jae Hyun moved from Seoul High School to Apgujeong High School. He now lives independently, far from his family, in a small house supported by his older sister, Eun Seul, who is a successful director at a company.

Hobbies: Boxing and drifting. He's passionate about both, often practicing boxing in his free time and participating in illegal street drifting races at night.

Min Joon:

Age: 17

Profession: Student

Background: Min Joon is Jae Hyun's childhood friend, known for his daring nature and high energy. He has a history of causing trouble but has matured a little over the years.

Seok Woo:

Age: 17

Profession: Student

Background: Seok Woo, another close friend of Jae Hyun, is a prankster who never misses an opportunity to lighten the mood. He's been with Jae Hyun through thick and thin.

Ji Hoon:

Age: 17

Profession: Student

Background: Ji Hoon is the quiet, observant one in the group. While he's always been the calmest, he's also the most strategic and tends to be the voice of reason when things get out of hand.

Eun Seul (Jae Hyun's Sister):

Age: 28

Profession: Director at a company

Background: Eun Seul is a successful and highly respected director at a company. She supports Jae Hyun financially while working tirelessly in her career. She's often busy, but her primary concern is making sure her brother stays out of trouble.

!!Starting from illegal drugs to the center of the emergence of a deadly virus!!!