What's Wrong with Secretary Kim — Characters & Cast

Initially driven to maintain his flawless lifestyle and keep Mi-so by his side at all costs; evolves into a desire to protect Mi-so, alleviate her pain, and earn her love as an equal partner.

Begins as an arrogant, hyper-competent corporate Vice Chairman who views human relationships through transactional utility. After facing the threat of Mi-so's resignation, he undergoes an emotional awakening, learning humility, vulnerability, and true empathy as he confronts his suppressed trauma.

Originally driven by financial responsibility to her family and a quest to find her identity; evolves into pursuing authentic happiness and mutual love without sacrificing her professional identity.

Starts as a tireless, ultra-poised secretary who sacrificed nine years of personal youth to pay off family debts. As she steps toward independence, she learns to voice her own desires, process forgotten childhood horrors, and choose her career and romance on her own terms.

Driven by a desire for narrative vindication, Mi-so's affection, and superiority over his brother; evolves into seeking psychological peace and genuine family reconciliation.

A bestselling author who harbors deep resentment toward Young-joon, believing his younger brother left him to be kidnapped as a child. When he learns that his memories are distorted false fabrications created by his own mind out of guilt, he suffers a psychological breakdown before accepting the truth and seeking forgiveness.

Helping Young-joon navigate romantic relationships while coping with his own post-divorce loneliness.

Yumyung Group's Director and Young-joon's closest confidant. A divorcee who dispenses romantic advice to Young-joon, he slowly learns from Young-joon's romantic progress to address his own past mistakes and reconcile with his ex-wife.