Je-hoon Lee

35-year-old architect Seung-Min receives a visit at his office from a woman. Seung-Min doesn't recognize the woman at first, but then realizes the woman is Seo-Yeon. Seo-Yeon is his first love, but he hasn't seen her since his freshman year in college. Seo-Yeon now has a request. She wants to hire Seung-Min to rebuild her home on Jeju Island. 15 years ago, Seung-Min is a naive young man beginning his architecture studies in college. He first meets Seo-Yeon in his Architecture 101 class. As they work on a class project together, Seung-Min and Seo-Yeon begin to fall in love. Back to the present day, Seung-Min is hesitant to take Seo-Yeon's job offer. Seo-Yeon persists and even goes to his boss with her wish. Seung-Min now has no choice, but to take on Seo-Yeon's home project. Old memories of love and heartbreak will soon resurface, as they find themselves at different junctions in their lives.

Towards the end of the Korean War an uneasy ceasefire is ordered, but out on the Eastern front line of the Aerok Hills fierce fighting continues. A race to capture a strategic point to determine a new border between the two Koreas is the ultimate prize. A bullet is then found in the body of dead company commander of the South Korean army. The bullet that killed the company commander belongs to the South Korean army. Lieutenant of the Defense Security Command Kang Eun-Pyo is ordered to go out into the Eastern front line and investigate the murder. When Kang Eun-Pyo arrives in the Aerok Hills he is surprised to find his old friend Kim Soo-Hyeok commanding troops in the Aerok Hills. Kang Eun-Pyo believed Kim Soo-Hyeok was dead. In their younger years, Kim Soo-Hyeok was a meek student, but he eventually became the leader of Aerok company as a lieutenant. The situation in the Aerok company raises many flags in the eyes of Kang Eun-Pyo. Soldiers wear North Korean uniforms inside due to the cold weather, a 20-year-old leads troops as a captain and the reappearance of his old friend Kim Soo-Hyeok. The countdown to the ceasefire begins as the lives of countless soldiers fall to the wayside ...