Romance Is a Bonus Book — Characters & Cast

To reclaim her personal name, financial independence, and self-respect, transforming from "someone's mother or ex-wife" back into Kang Dan-i.

Begins broken, homeless, and stripped of identity after her divorce. By humbling herself to take an entry-level task contract at Gyeoroo, she gradually reclaims her voice, wins marketing competitions, overcomes corporate prejudice, falls in love with Eun-ho, and establishes herself as an indispensable marketing planner.

To serve as an enduring, safe sanctuary for Dan-i while faithfully protecting the dignity and literary legacy of his mentor.

Starts as an accomplished, seemingly aloof author and chief editor who conceals emotional wounds and the secret caretaking of his mentor. Through supporting Dan-i, he moves from silently loving her from afar to expressing open vulnerability, while guiding Gyeoroo Publishing through creative transitions.

To curate exceptional literature and earn Eun-ho’s acknowledgment, growing into authentic self-assurance in both career and love.

Known as the formidable "Ice Witch" editor, she harbors an unrequited crush on Eun-ho. She navigates heartbreak with dignity and professionalism, evolves into Dan-i's champion and mentor, and eventually finds mutual romantic potential with Ji Seo-joon.

To uncover the truth behind his father's abandonment and validate his worth as an independent artist.

A warm and talented freelance book cover designer who initially pursues Dan-i romantically while secretly investigating the disappearance of author Kang Byeong-jun. Upon discovering that the author is his estranged biological father, he achieves emotional closure and begins a romance with Hae-rin.

To maintain the financial solvency of Gyeoroo Publishing without sacrificing its literary soul or ethical principles.

Operates as a comedic, cost-conscious executive whose theatrical demeanor conceals deep loyalty to his staff and an unwavering reverence for literature.