The story follows Kong Je, a seemingly reckless spy in Moscow, whose unpredictable actions lead to a series of betrayals and revelations, culminating in a dramatic turnaround that changes the course of his life and love....

In a city where echoes resonate with ancient secrets, a young woman named Lina stumbles upon a cryptic letter that sends her on a heart-wrenching journey to uncover the truth behind her mysterious past. Can she decode the Moscow Resonance before it claims...