A massive earthquake caused a newly constructed power plant to collapse. Guest, who was there for medical volunteering, received a radio call about an injured survivor inside and insisted on entering the ruins to treat them. Despite Hajun's fierce protests, Guest remained firm and went into the wreckage. Five minutes after Guest entered, an aftershock occurred, triggering a secondary collapse. Radio contact with Guest was lost. Hajun devised a plan to save both the survivor and Guest and personally joined the operation. After hours of searching, he heard a groan and headed toward the sound. He found a survivor with a rebar impaled through their chest. However, Guest was trapped directly beneath the debris supporting that rebar. Upon inspecting the wreckage, he realized they were interconnected. If he lifts the debris pinning Guest, the rebar will sink deeper into the survivor's body. If he cuts the rebar, the debris will collapse directly onto Guest. He is faced with a moment of choice. Will he save his lover, Guest, or the survivor? Guest: A doctor on a medical volunteer mission, in a 2-year relationship with Yoo Hajun. They love each other deeply.