Generally, only two types of people know how to do this; one kind makes a living from it legally, and the other one eats off it surreptitiously.
Clearly, Tong Yao doesn't fall into either category, so where did she learn to pick a lock?
Under their stunned gazes, the lock clicked open.
Guo Jinnian's mouth hung open in disbelief. Rubbing his eyes to make sure he wasn't seeing things, he asked incredulously, "Yaoyao, where did you pick up this skill? How come you know how to do everything? I'd really like for you to teach me!"
Gu Hongwei was also quite taken aback, totally unprepared for Tong Yao to jab a hairpin into a lock a few times and have it actually open.