Taesan, a young team leader at Janghyun Construction, arrives in Jochiwon to prevent a flood at the Heungbok Reservoir— only to reunite with his first love from college, Suyeon. “You haven’t changed, Lee Suyeon. Still thoughtful, careful, and distant…” Though Suyeon tries not to waver, Taesan can’t help but feel the same emotions stirring within him. The only thing that’s changed is the ten years that passed without each other— ten years that made them both adults. “Take your time to hesitate. Think it through for as long as you need. I’ll wait.” Because the invisible line between us— I crossed that a long time ago.