Watch The Front Line for Free: How to Stream the Movie Online at 123Movies. . In 1951 ceasefire is declared, but two remaining armies fought their final battle on the front line Towards the end of the Korean War, a South Korean battalion is fiercely battling over a hill on the front line border against the North in order to capture a strategic point that would determine the new border between two nations. The ownership of this small patch of land would swap multiple times each day. Kang is dispatched to the front line in order to investigate the tacit case that’s been happening there.