Ashfall breaks the opening admission record of ALONG WITH THE GODS, it has the highest opening admission among the winter films in Korea. An unexpected eruption of Korea's tallest volcano, which straddles the China-North Korea border, leaves the Korean peninsula in shambles. Seismologists warn this is only the preliminary eruption – A devastating super-eruption is still to come. Yoo-kyung (JEON Hye Jin) is Chief Secretary to the President of South Korea. She meets renowned Korean-American seismologist, Bong-rae (Don LEE). Bong-rae presents a theory that could possibly stop the volcanic explosion. In-chang (HA Jung Woo) is only days away from completing his service with the Explosive Ordinance Disposal Unit of the South Korean Army. He is called way to his last mission before returning home to his wife, Ji-young (BAE Su Zy). In-chang’s team secretly reaches out to a North Korean elite officer, Jun-pyong (LEE Byung Hun), who holds the key to the mission to stop the volcanic eruption. However, Jun-pyong keeps acting erratically. With doom looming, everyone must work together to avoid imminent devastation. Ki-taek's family of four is close, but fully unemployed, with a bleak future ahead of them. The son Ki-woo is recommended by his friend, a student at a prestigious university, for a well-paid tutoring job, spawning hopes of a regular income. Carrying the expectations of all his family, Ki-woo heads to the Park family home for an interview. Arriving at the house of Mr. Park, the owner of a global IT firm, Ki-woo meets Yeon-kyo, the beautiful young lady of the house. But following this first meeting between the two families, an unstoppable string of mishaps lies in wait.