The situation in Country B was somewhat similar to that of Fairy Tale City. Xu Huo had previously speculated that the monster surge in Fairy Tale City wasn't caused by locals mutating but rather, like Country B, those monsters had entered from an external area.
The initial screening train was met with a large number of Train-Assaulting Mutants every night as it passed through various regions, indicating that many areas in the game world were occupied by these creatures. Whether the game was meant to avoid these monsters or deliberately sent the train through their territories to select players, the mutated Evolvers and players were not completely killed. Instead, they were kept in certain areas.
So, the sudden monster surge in Fairy Tale City and Country B—was it man-made, or an intrinsic selection mechanism of the game?