Crystal

When Ye Xingchen came out of the bathroom, Lin Sijia was already gone. She had already started to dissect a rat in the laboratory.

Previously, for the sake of convenience, in addition to having a laboratory, Ye Xingchen had also specially reserved a room for Lin Sijia to do experiments.

After all, Ye Xingchen had thought that if Lin Sijia had developed something useful to him in the laboratory, someone might enter the laboratory to steal it at night. Moreover, many times, when Lin Sijia was in a hurry, she would not even have time to eat, let alone sleep. Therefore, Ye Xingchen simply vacated a room for Lin Sijia.

After all, there was no lack of rooms here. Lin Sijia could do whatever she wanted.

That crystal thing really wasn't stuffed in by the shopkeeper but grew out of the mutated rat.