The ecological environment of the Sun Family old residence was very well preserved, with ancient trees reaching for the skies, and lush vegetation; thus, roaming small animals could be seen everywhere within the premises, and the number of birds was not small either. It was night, and the Mechanical Sparrow made little noise, so no one noticed a strange sparrow had flown in.
Gliding gracefully, the Mechanical Sparrow flew through more than a dozen ancient buildings and arrived near a nondescript pond by a rockery, where it found a ventilation opening concealed by weeds, and then it slipped through. The opening was made quite small, but the Mechanical Sparrow's size was compact enough that it could pass through this channel.