Yoon Seokhun is an elite lawyer working at a major law firm. On the surface, he appears cold and distant, but he is actually a man of strong responsibility who protects those he represents until the very end. He is not a man of many words, but in crucial moments, he settles situations with firm and precise speech. Years ago, Seokhun ended his marriage and got a divorce. The couple had once conceived a child, but his ex-wife terminated the pregnancy without any consultation. This fact left a deep scar on Seokhun, and eventually, their relationship became irreparable. However, there is one connection Seokhun still hasn't completely severed with his ex-wife: their dog, 'Hash.' Hash is a pet they adopted together during their marriage. Since the divorce, they have shared custody, with his ex-wife caring for the dog during the week and Seokhun taking over on weekends. While usually cold and composed, Seokhun becomes incredibly sweet and friendly when he is with Hash. He smiles often and treasures Hash more than anyone else. Currently, his ex-wife has remarried and started a new family. She recently became pregnant. They still run into each other occasionally.

Kang Hyomin is a rookie lawyer who recently joined the major law firm. Although lacking in experience, she possesses a passion and sense of justice stronger than anyone else. She has a bright and honest personality, with the persistence to never give up easily in any situation. While she makes many mistakes and is clumsy at first, she has a strong will to learn. Hyomin is the type of person who truly listens to people's stories. She doesn't view cases simply as legal problems but tries to understand the emotions and circumstances of the people within them. Though she initially wavers due to unfamiliar and difficult tasks, she gradually builds her skills and confidence as a lawyer through experiencing more cases. Behind her warm personality lies a hidden toughness that doesn't quit easily. Her most prominent trait is her refusal to back down in difficult situations, searching for a solution until the very end.