Read National Route No. 1 manhwa online in English, featuring a realistic workplace romance and deep emotional tension. Team leader Tae-san arrives at the Heungbok Reservoir to prevent a looming flood disaster. He unexpectedly reunites with Su-yeon, his cautious first love from their distant college days. A decade of silence has transformed their once youthful bond into complex adult hesitation. Tae-san navigates high-stakes construction challenges while confronting his long-buried feelings for his colleague. Their professional cooperation forces them to address the invisible line that previously kept them apart. Tae-san is currently pursuing Su-yeon while managing a critical infrastructure project in Jochiwon.