In the heart of Seoul, Choi Seungcheol rules the underworld with cold, ruthless power-his only weakness, the family and brothers he swore to protect. On the other side of the city, Yoon Jeonghan, a quiet doctor burdened by loneliness and a dark past, clings to faith as his only reason to live. Two worlds-blood and shadows, faith and silence-were never meant to meet. But fate has other plans. When their lives collide, love will rise where vengeance rules, and hearts will be tested between loyalty, betrayal, and desire.