Three friends determined to die are denied by death itself and sent to uncover the truth behind a mass poisoning at Hongpyeong Pension. As hidden secrets and suspicions emerge among the survivors gathered there, Yeon begins to cling desperately to life, causing a painful rift with Irim, who still longs for them to die together. When the true killer finally strikes again, Yeon barely survives, forever marked by death’s shadow.