Lim Oju sat at his cluttered desk, the flickering light casting shadows on the walls. His eyes, weary yet fierce, were fixed on a photograph of his late fiancée, her smile a haunting reminder of a brutal past. The city outside buzzed with life, oblivious to the turmoil within him. "I won't let you down, Mi-kyung," he whispered, his voice filled with determination and sorrow.

Lim Oju faced a nervous suspect, his gaze piercing through the man's facade. The walls seemed to close in, amplifying the tension in the air. "Tell me about the Scorpion. Who's pulling the strings?" he demanded, his voice steady yet urgent. The suspect shifted uneasily, sweat beading on his forehead. Lim Oju leaned forward, relentless in his pursuit.

Jang Hyun, a smirk plastered on his face, leaned against a graffiti-covered wall. His arrogance was palpable, a stark contrast to Lim Oju's steely resolve. "Still chasing shadows, Detective?" he taunted, his voice dripping with disdain. "One day, I'll catch up to you," Lim Oju replied, his eyes never leaving Jang Hyun's.

Lim Oju recalled happier times, the memory of a picnic with Mi-kyung playing vividly in his mind. Her laughter echoed, a bittersweet melody that stirred his heart. The sunlight filtered through the leaves, casting dappled shadows on their faces. "Promise me we'll always be together," Mi-kyung had said, her eyes full of love. Lim Oju nodded, unable to speak through the lump in his throat.

Lim Oju stood before the board, connecting the dots that led to the heart of the Scorpion gang. Each thread brought him closer to the truth, the mastermind's identity slowly coming into focus. "It's all connected," he muttered, piecing together the puzzle that had eluded him for so long.

Lim Oju faced the mastermind, a shadowy figure hidden in the gloom. The air was thick with anticipation, the silence broken only by their measured breaths. "It's over," Lim Oju declared, his voice resolute. The figure stepped into the light, revealing a familiar face, the revelation hitting Lim Oju like a tidal wave. "You?" he whispered, disbelief mingling with the fire of justice in his eyes.