A volcano on Baekdu Mountain suddenly erupts. Pandemonium ensues on the Korean peninsula, with more eruptions predicted in the area. To prevent another disaster, Jeon Yoo-kyung (Jeon Hye-jin) plans an operation based on a theory by Professor Kang Bong-rae (Ma Dong-seok). He had has studied Baekdu Mountain and its possible eruptions. Jo In-chang (Ha Jung-woo) is the captain of a special forces team. He is tasked to take part in the operation, which holds the fates of South and North Korea in the balance. Jo In-chang contacts Lee Joon-pyeong (Lee Byung-hun) who is part of the Ministry of People's Armed Forces of North Korea. Meanwhile, Jo In-Chang's wife Choi Ji-young (Bae Suzy) is alone in Seoul. She struggles to survives against the disaster.