- Doomsday background: Five years after the outbreak of the "Red Fog Catastrophe", the global Red Fog spreads, mutant creatures run rampant, human civilization collapses, survivors form scattered bases, resources are extremely scarce, and trust becomes a luxury.
- Female protagonist: Lin Wan, who was an emergency department nurse before the disaster, is now the leader of the medical team of "Pan Rock Base". She is calm and decisive, good at field first aid and close combat, and she has always been thinking about the missing male protagonist deep in her heart.
- Male protagonist: Lu Zheng, he was a retired soldier of the special forces before the disaster. Now he is a "lone traveler". He is extremely powerful in combat, masters a variety of survival skills, has a calm and taciturn personality, and is always looking for traces of the female protagonist.
- Core conflicts: survival crisis (mutated creatures, competition for resources), base conflicts (internal power struggles, external hostile base threats), emotional entanglements (rebuilding trust after reunion, past regrets).
