Create a 30-second photorealistic AAA third-person open-world action-adventure gameplay video, 16:9, resembling real playable Unreal Engine 5 footage, not a cinematic trailer. Young Korean female adventurer, mid-20s, exact same face, low dark ponytail, athletic build, dark teal weatherproof jacket, black shirt, brown cargo pants, rugged mountain boots, gloves, compact expedition backpack, climbing rope and metal compass bracelet throughout. Use a normal player-controlled third-person camera behind and slightly above her, with authentic movement, realistic physics, shadows, materials, animation and environmental interaction. She runs through a remote mountain railway station during a violent snowstorm as an approaching passenger train suddenly derails on a damaged mountain track. HUD: "REACH THE LAST CARRIAGE." The train crashes through the station platform and begins sliding toward the edge of the mountain. She sprints after it, jumps across broken railway equipment and grabs the rear carriage just before it falls over the cliff. HUD: "BOARD THE RUNAWAY TRAIN." She climbs across the exterior of the moving train while heavy snow, shattered windows, loose metal panels and electrical cables whip around her. The train loses more carriages as it slides down the mountainside. She reaches the final intact carriage and pulls herself inside. The carriage suddenly breaks away from the rest of the train and begins sliding uncontrollably down a steep mountain slope. She braces against the seats as luggage, broken glass and debris move through the carriage. HUD: "SURVIVE THE DESCENT." The carriage crashes through an abandoned railway tunnel entrance and continues deep underground. She climbs through the damaged carriage, jumps across a widening gap and uses her climbing rope to cross into the next section. The tunnel shakes violently as sections of the mountain collapse behind her. She reaches the front of the carriage and discovers an enormous underground railway system hidden beneath the mountain, containing abandoned platforms, massive industrial machinery, suspended railway bridges and multiple railway lines disappearing into darkness. HUD: "INVESTIGATE THE UNDERGROUND RAILWAY." A distant train horn suddenly echoes through the darkness. Headlights appear far down the tunnel and rapidly approach. She turns and runs as an enormous unmanned locomotive tears through the underground station, destroying platforms and sending debris across the tracks. She jumps onto a moving maintenance platform and grabs a hanging chain as the locomotive passes beneath her. The platform collapses behind her and she lands on a surviving railway bridge above a gigantic underground chasm. She looks across the chasm and sees an enormous ancient railway structure built directly into the mountain, extending toward a colossal sealed gateway. The HUD updates: "FOLLOW THE RAILWAY." Photorealistic Korean mountain UE5-quality gameplay, realistic train destruction and physics, physically accurate snow, debris, glass, metal deformation and environmental interaction, authentic third-person player-controlled camera movement, functional minimal HUD, strict character and equipment consistency, continuous real-time gameplay feel, no cinematic trailer look, no dramatic camera cuts, no slow-motion hero shots, no mobile-game graphics, no anime, no cartoon, no gore, no subtitles, no logos, no watermark.