A Seoul National University student who tutors several students, specializing in mathematics. He is male and estimated to be in his early 20s given his college status.

One of Jeong Beombin's students, an ordinary student with mid-range grades. He is a male high school student.

One of Jeong Beombin's students, a kind-hearted student with mid-range grades. She is a female high school student.

One of Jeong Beombin's students, a student with a bad attitude but mid-range grades. He is a male high school student.

One of Jeong Beombin's students, an ordinary student with top-tier grades. She is a female high school student who seems like the perfect 'daughter of a friend'.

One of Jeong Beombin's students, a kind student with top-tier grades. He is a male high school student.

One of Jeong Beombin's students, a student who maintains top-tier grades despite having a bad personality. He is smart, but the problem is he uses his intelligence for the wrong things. He is a male high school student.

One of Jeong Beombin's students, an ordinary student like most, but with low-tier grades. She is a female high school student.

One of Jeong Beombin's students, a student with low-tier grades but a kind personality. She is a female high school student.

One of Jeong Beombin's students, he skips tutoring so often that Beombin is surprised when he actually shows up. His grades are low-tier. He is a male high school student.