Since he was three he has tried to leave this residence and go out but he was refused. Now that the maid accepted taking him along, he felt something was not right, but he just ignored it. He turned and rushed towards the balcony to inform his mother.
He was not foolish enough to not understand the dangers that exist in this world. As for why he informed Qin Zhu, he was certain she had something to do with him being allowed to go out.
But all of this didn't matter anymore, as long as he could see the situation outside the residence, and how people really lived out there he would be pleased. He was even curious about the way things worked from roads to other things. He would probably not get all the answers, but he should be able to understand something.
Indeed just as he expected, after informing Qin Zhu, she just told him to go. She was clearly the one that instructed that old woman to take him along.
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