Kim Hajin, a struggling web novelist, wakes up inside the very story he was writing, but as Kim Chundong, a minor extra with no role in the plot. The world of his unfinished novel, centered on protagonist Kim Suho, now runs without him, and discrepancies he never wrote keep surfacing. Armed with a laptop that holds the powers and secrets he invented, Hajin sets out to survive a story whose script keeps drifting away from his own.