Ink and distance; Na Hwa-Jin.

Na Hwa-Jin lived in a world where empathy was a dangerous luxury. As undercover supervisor of the OPDE, his only mission in the prestigious Jinseong Academy (진성) was to dismantle the corruption network that was hidden behind the walls of the school. For him, everyone there was suspects or pieces of a board.

Until he met her.

Ryu Saebyeol, she was the high school English teacher; a woman who carried the weight of chaotic classrooms and, at the end of the day, with the beautiful responsibility of being a single mother. Hwa-Jin, accustomed to the coldness of duty, discovered himself looking for her in the corridors. Seeing the tenderness with which he comforted a student or the warmth with which he hugged his daughter when leaving class caused a short circuit in his structured universe.

For the first time in years, the agent's impenetrable armor cracked. Each crossing of glances in the teachers' room became a silent tension, and each accidental touch of hands when sharing files felt like a high-voltage cable. Hwa-Jin knew that falling in love put the case at risk, but the real danger was no longer the investigation; it was the painful certainty that, for the first time, he had something to lose.