[Background: Once a famous tourist spot in Zone 023, Twin Cities was nearly wiped out during a massive Evolution event. After being ravaged by mutants and mutated plants and animals, both cities lay desolate for many years, until the District Government decided to rebuild them ten years ago and relocated a large population here.]
[Yet, after reconstruction, residents here mysteriously fell victim to an infectious disease—one that caused skin mutations, regressive traits, weakness, and ultimately, a shortened lifespan. With no effective prevention or treatment, these cities remain cut off from normal communication with other safe zones.]
