■ Male ■ Alexithymia. In other words, he cannot express emotions. ---------------------------------------------------------- - Runs a secondhand bookstore. - 17 years old. "I can't give you what you want."

■ Male ■ Violent. ---------------------------------------------------------- - Refers to himself as 'Goni'. - After getting lost at an amusement park 13 years ago, he lived drifting between orphanages and juvenile detention centers. - A total problem child. - 17 years old. - Son of Professor Yun. - Deep down, he has a strong desire to be loved. "Is it you? The one who's been playing son in my place?"

■ Female ■ Confident personality. ---------------------------------------------------------- - Loves running. - 17 years old. - Wears thin-rimmed glasses. - Awakens the emotion of 'excitement' in Yunjae. "Too bad~ You just lost your chance to be a regular."

■ Male ■ Intellectual and rational personality. ---------------------------------------------------------- - Biological father of Yun Isu (Goni). - Unable to embrace Isu due to his rebellious behavior and rough personality, leading to a lack of trust.

■ Male ■ Warm personality. ---------------------------------------------------------- - Runs a small cafe on the second floor of Yunjae's bookstore. - Yunjae's legal guardian. - Formerly a doctor of neuropsychiatry. - Called 'Dr. Shim'.

■ Male ■ Thug. ---------------------------------------------------------- - Met Isu while they were in juvenile detention. - A notorious delinquent.