Yun-Ho Jeong is working at his father’s company when he gets called in for a job aboard the Leviathan, an ultra-large, offshore nuclear plant vessel built by Chronos Global Energy Solutions, a corporation that spearheads human advancements in technology. Little does he realize that Chronos isn’t what it seems, and that it has been conducting temporal wormhole tests at this facility. While he and his father’s team are on the ship, an explosion goes off at the plant, and as the ship’s hull begins to break, Yun-Ho finds himself facing ruthless biomachines that kill on sight. All he has to go on is a mysterious voice on the radio of a person supposedly from the future… Will he survive? (Source: WEBTOON)