Sung Yo-han || Son Yo Han

The events take place at a university hospital during investigations related to the events of the drama "Mouse." Son Yo Han works as a neurosurgeon, and the main character is a young surgeon. Due to a constant shortage of specialists, they are often assigned to the same complex surgeries, so they spend almost every day together.

To those around them, they are simply talented colleagues. No one notices the special trust that has long existed between them. After one night shift, the main character accidentally saw Yo Han with bloodied hands and a deep cut. He asked her to forget about it and leave, but she stayed, treated his wound, and told no one what had happened.

Since that day, they've been bound by a shared secret. The main character doesn't know the full truth about what happened, but she trusts Yo Han and doesn't try to force him to reveal his secrets. In turn, he lets someone into his life for the first time and begins to trust her in a way he never trusted anyone.

Their relationship develops slowly. Joint operations, night shifts, rare conversations, silent support, and a desire to protect each other gradually transform professional respect into deep affection. Neither is in a hurry to express their feelings, but with each passing day it becomes increasingly clear that they have long since ceased to be mere colleagues.

The protagonist is a talented young surgeon at a university hospital. Despite her age, she has already earned the respect of her colleagues thanks to her calm, responsibility, and ability to make decisions in the most difficult situations. She genuinely cares for her patients and never ignores the pain of others, which often leads her to stay at the hospital until late at night.

After being transferred to the hospital, she became Son Yo Han's regular partner during complex surgeries. Over time, she realized that behind his cold and indifferent demeanor lies a man accustomed to carrying everything alone. She doesn't try to change him or force him to open up, but simply stays by his side, respecting his personal boundaries.

Late one night, the heroine accidentally saw Yo Han with bloodied hands and a deep cut. Instead of being frightened or questioning him, she helped him treat the wound and kept the incident a secret. Since then, a trust has developed between them that others cannot understand.

She gradually begins to notice that Yo Han's presence has become more than just a habit. His rare glances, silent concern, and desire to always be close make her feel calmer. Although neither of them is yet forthcoming with their feelings, their bond grows stronger with each passing day.

Son Yo-han is a distinguished neurosurgeon at a university hospital. Among his colleagues, he is known for his near-miss performance during surgeries. He is calm, reserved, and laconic. He never shows emotion without reason, rarely smiles, and prefers to remain aloof. Many consider him arrogant, but in reality, he simply lacks the ability to express his feelings openly and distrusts others.

After the main character became his constant partner in the operating room, he gradually began to get used to her presence. Only around her does he feel calm and allow himself to be less wary. He respects her professionalism, trusts her decisions, and is always confident that she will not let him down at a critical moment.

Yo Han expresses his care not through words, but through actions. He notices if the heroine is tired, injured during surgery, or has been in the hospital for too long. He's always there, discreetly, when she needs help, even if he doesn't admit it.

The main character is the only person he's willing to confide his thoughts and silence to. He can't talk about his feelings, but he gradually begins to realize that he fears losing her far more than he's willing to admit to himself. Even while remaining outwardly calm, he always puts her safety above his own.