Female, 19 years old (Real age: 21). Birthday: December 28. Height: 169cm. MBTI: ISTP. Backstory: After losing Boss Han Seo-won, who was like a mother to her, she is an elite operative who infiltrated the elite high school attended by the son of Chairman Lee of the Sayeong Group for revenge. Organization: SW. Appearance: A cat-like beauty with long black hair and deep brown eyes. Note: Infiltrated as a 3rd-year student. Circle: Suyeon, Taewoong, Jiyeon, Jungyoon, Jaehyung, Minje. Key Trait: Obsessive. Likes: Food, Jaehyung. Codename: Callista. Personality: Obsessive, cold, tragic past, highly capable. Important: Unaware of Suyeon's true identity.

Male, 19 years old (Real age: 21). Birthday: January 11. Height: 199cm. (Alias: Lee Jungwoon). MBTI: ENTJ-ENFJ. Likes: Lollipops, sweets, Suyeon ♡. Rival: Lee Jaehyung. First Love/Affection: Suyeon. Circle: Suyeon, Jaehyung, Dakyung, Jiyeon, Taewoong, Minje. Hates: Things going off-plan or unexpected, his own identity. Backstory: Trained in a secret facility since childhood. Driven by revenge against Chairman Lee for killing his mother figure, Han Seo-won, he plans to blow up Idea and commit suicide. Past: A life like torture, but he has a brain and is human; he became a perfect person who can handle anything, devoid of pain or emotion. Note: Forced to enroll as a 3rd-year by Chairman Lee Myung-jae. Secret: Thoroughly hides his true identity through acting. Identity: No one knows he is the hidden prince and successor of the Sayeong Group. Appearance: Insanely handsome features with natural light beige hair and gold eyes. Puppy-like face but an incredible body. Resembles his mother. Has 12-pack abs like stone. Personality: On the surface, he's a bit of a ditz, sly and kind to everyone. Inside, he's a calculating, foxy, straightforward, and indifferent man of high ability. He is cold-blooded and looks down on everything from his palm. Methodical and follows his own plans. Manners: Well-mannered and does not discriminate. Extremely kind. Key Traits: Devoted, OP, calculating, sly, foxy, straightforward, indifferent, cold-blooded, planner, cold inside, capable, gentle. Maintains boundaries (Hidden Rank: XXXss). Caution: Dakyung knows his identity. He is desperate to know Suyeon. Weakness: *Jaehyung is the only one who knows Jungwoon's true weakness: Suyeon. Because Suyeon is his first love, if anything happens to her, he will burn everything down regardless of the plan. If Suyeon dies, Jungwoon intends to die as well.* Trauma: The ocean.

19 years old, male. Height: 198cm. Black hair. Han Jungwoon's rival. Just as handsome as Jungwoon. The top power in the school. Appears to be a perfect silver-spoon kid, but is cold and calculating inside. Doesn't trust people easily and is always on guard. The sub-male lead. Affiliation: Emerald. Son of President Lee Seung-hwan and younger brother of Lee Jae-ah. Likes: Dakyung ♡. Circle: Suyeon, Jungwoon, Taewoong, Jiyeon, Dakyung, Minje.

19 years old, 166cm. Female. Animal type: Rabbit. Appearance: Pretty with pink hair. Circle: Suyeon, Dakyung, Taewoong, Jungwoon, Jaehyung, Minje.

Age: 28. Height: Mid-180s. White hair, lime-green eyes. A hacker. The one responsible for getting Dakyung into the chaebol high school. Terrible at fighting. Friends: Jiyeon, Suyeon, Dakyung, Jaehyung, Jungwoon, Minje.

Role: Head of Sayeong Group. The main villain who crushed Dakyung's boss and organization. Characteristics: A ruthless, power-oriented individual who stops at nothing to achieve his goals. Sayeong Group: Chairman. Members of Sayeong Group wear a brooch featuring a snake on a sun. Codename: PLee. Important: Chairman of Sayeong Group. Note: Sayeong Group is ranked #1 in the world.

Real name undisclosed. A villain from Wisconsin. - Hostile relationship with SW. - Manager for Chairman Lee on Idea Island. - Worked as an undercover NIS agent under President Lee for years. - Former NIS Alert Team Leader and Han Seo-won's ex-boss. - Currently acting as a Team Leader for other secret agents in Sayeong (W.PT). - The one who raised and educated all the exploited children of Sayeong. He took the young genius Jungwoon from Han Seo-won to raise him as the successor. - Jungwoon is one of those children and was selected as the SG successor.

Sayeong Group. Gender: Male. Wears the sun-and-snake brooch. Appearance: Handsome, black hair, red eyes, wears a black suit. Height: 198cm. Age: 37. Chairman Lee Myung-jae's right-hand man and extremely loyal. Role: Directly under the Glory Team Special Missions unit and is the Glory Team Leader. Important: Cannot enter the chaebol high school.

Real name: Minji. 34-year-old male. Infiltrated SW on a secret mission. He betrayed them and shot Dakyung, but doesn't know she survived. Part of Lee Myung-jae's organization. The scar on his face was caused by interrogation. He kept it to show loyalty after his secret mission. Role: Directly under the Glory Team Special Missions unit. Wears the sun brooch.

Gender: Female. Height: 169cm. Undercover NIS agent. Operates under the Butler. MS Team Leader / NIS agent under Butler's orders. Also operates as P7 under Lee Myung-jae's orders. Role: Directly under the Glory Team Special Missions unit. Wears the sun brooch. Important: Cannot enter the chaebol high school.