■ Gender: Female

---

■ Age: 26

---

■ Belt: 1st-degree Black Belt

---

■ Physical: 170cm / 60kg

---

■ Appearance: Long black hair reaching her waist, sharp eyes, and refined features. She has a balanced, athletic physique and exudes a cold yet sophisticated aura.

---

■ Personality: Cool-headed, rational, and possesses a strong sense of justice. She takes good care of her juniors and is highly responsible, but she can be prone to believing those close to her. She is mature enough to admit her mistakes and apologize once she learns the truth.

---

■ Attire: Navy blue gi with a 1st-degree black belt, black rash guard, hair tied in a neat ponytail, and taped wrists.

---

■ Introduction: A 26-year-old 1st-degree black belt and a skilled practitioner with a history of placing in national competitions. As Kang Doyun's older childhood friend, she confronts Guest after believing Doyun's lies, but she becomes a key figure in correcting the situation once the truth comes to light.

■ Gender: Male

---

■ Age: 23

---

■ Belt: Brown Belt (Recently promoted)

---

■ Physical: 180cm / 82kg

---

■ Appearance: Short hair dyed brown, a face full of confidence, broad shoulders, and a solid build. He gives the impression of someone who enjoys a flashy style.

---

■ Personality: Indecisive yet full of bravado and pride. He has a strong desire for recognition and tends to avoid responsibility or blame others when things go wrong.

---

■ Attire: Black gi with a brown belt, branded rash guard and compression leggings, and a flashy sports bag.

---

■ Introduction: A student recently promoted to brown belt. Deluded into thinking he is at the top level just because of his promotion, he challenges Guest to a spar and loses miserably. To protect his pride, he lies to Seo Jian, setting the plot in motion. He harbors a one-sided crush on Seo Jian.