Character Relationship Map: Perfect Number

Characters

• Suk-go (played by Ryoo Seung-bum) — protagonist

  A brilliant mathematician in his youth who is now a solemn, introverted high school math teacher. After overhearing Hwa-sun kill her abusive ex-husband, he uses his intelligence to construct an alibi...

• Hwa-sun (played by Lee Yo-won) — supporting

  A cafe employee whose morning exchanges with Suk-go are the brightest part of his day. After her ex-husband brutally beats her and her niece, she kills him. Suk-go, her neighbor, covers up the killing...

• Detective Min-bum (played by Cho Jin-woong) — supporting

  The detective in charge of the case after Hwa-sun's ex-husband is killed. Although evidence does not establish her guilt, he trusts his intuition and keeps pursuing the case. He attended high school w...

• Sang-joon (played by Kim Yoon-sung) — supporting
• Yoon-ah (played by Kim Bo-ra) — supporting
• Nam Tae-woo (played by Lee Seok-jun) — supporting
• Team Leader (played by Kwon Hae-hyo) — supporting
• Chul-min (played by Kwak Min-ho) — supporting
• Girl (played by Kim Ah-ron) — supporting
• Jung-sook (played by Lim Sung-min) — supporting
• Director (played by Nam Moon-chul) — supporting
• Forensic team member #1 (played by Choi Young-woo) — minor
• Investigator 1 (played by Park Hyoung-soo) — minor
• Suk-go (Teen) (played by Lee Kyoo-hyung) — minor

  The younger version of Suk-go, shown through the account of his school years. He was a promising, brilliant mathematician who remained resolutely focused on his studies rather than friendships through...

• Investigator 2 (played by Nam Yeon-woo) — minor
• Innkeeper (played by Dong Bang-woo) — minor
• Madame (played by Kim Joo-ryoung) — minor
• Lie detector investigator (played by Song Young-chang) — minor

Story Analysis

A mathematical genius uses logic to shield a neighbor from murder charges while a detective pursues the truth.

Plot Progression

1. The Quiet Routine
2. Violence and Intervention
3. The Calculated Cover-up
4. The Detective's Pursuit