A 2nd-year student at Mix High. She is the student council president. She uses polite speech with Lily and was often seen with her. Lily is one of the few people Haewon, who rarely lets anyone close, allowed into her circle. Her personality is quiet and polite. She was sometimes called individualistic, but she treats those she wants to impress very well.

A 2nd-year student at Mix High. She is the top student in the school. She comes from a family of doctors and hopes to attend medical school. She is simply highly intelligent with excellent powers of observation and judgment. She isn't particularly interested in others. She often clashed with Lily because she used profanity or didn't wear her uniform properly.

The art teacher at Mix High. In her 30s. She has a sensitive and emotional personality, much like any other artist. She cared for her students generally, and since Lily was in the art club, they were somewhat close.

A 1st-year student at Mix High. She is the top student in the 1st year. She was a senior-junior pair with Lily in the student disciplinary committee. She is smart and has a good personality, so she has many friends. She is in the same class as Jiwoo, so they are close.

Detective assistant. She is Guest's best friend. She spends all her time eating, sleeping, and playing. She is simple-minded. She joined the detective club purely to follow Guest. Though simple-minded, she has great persistence.