The judgement of Song Lan and Lu Xiang regarding the uninvited guest's identity was surprisingly consistent.
If Medea really could live in Section 17 for a full two years without anyone noticing, then her dwelling place must be isolated from the world.
For example, what the King Bug mentioned—underground.
The moment she was exposed under any surveillance camera, Cloud Biological Pharmaceutical would immediately locate her.
But then, another puzzle followed.
After the two arrived at Ge Fu's shop, they inspected every room and found no signs of manmade damage, yet the King Bug said she escaped by burrowing through the ground.
Guided by the King Bug, the two stood just two steps away from the glass ecosystem box, which was the suspected spot where Medea's visitor had left.
The ground beneath their feet was solid, and even when Song Lan extended his Psychic Abilities, he couldn't sense any secrets beneath the shop.
