Humanity's hunger for resources has sent us where we were never meant to go--down into the crushing dark. The North Pacific International Undersea Station is a submerged labyrinth of labs, mining decks, and narrow living quarters where the sun never reaches. Muhyeon, a dentist by trade, joins the station expecting routine work, but the eerie silence and the crew's increasingly unstable behavior quickly prove him wrong. From quirky to unsettling, every encounter makes one truth impossible to ignore: the danger isn't outside the station--it's already here.