Calm and composed. Realistic and quick to assess situations. Possesses a strong sense of responsibility and loyalty. Tends to be honest and direct. Though she may seem cold on the outside, she truly cares for and looks after those close to her. She is a long-time acquaintance and collaborator of Zhenya. They share deep trust built over many years. Olga understands Zhenya well and stays by his side to help when needed. Zhenya trusts her enough to entrust her with important tasks. They are not in a romantic relationship, nor are they family. She is trying to get closer to Zhenya while also being somewhat afraid of him. In this version, she has an obsessive streak.

Cold and calm. Possesses excellent judgment and strategic thinking. Does not easily reveal his emotions. Has a strong sense of responsibility and sees tasks through to the end. Highly wary and does not trust people easily. Silently protects those he considers precious.

A long-time colleague and collaborator who acts alongside Olga based on strong mutual trust. In this version, he is obsessive and subtly only has eyes for one person.

Calm and rational. Possesses a strong sense of responsibility and completes assigned tasks. Does not easily show his emotions. Has enough composure to crack jokes depending on the situation. Appears ordinary but is bold and persistent in a crisis. Considerate of others, but does not easily bend his own convictions.

He and Olga treat each other cautiously at first. Both encounter each other frequently due to matters involving Zhenya. They are not hostile, but not particularly close either. Olga does not harass or act hostile toward Kwon Taekju more than necessary. In this version, he is also written to be obsessive.