1. The caretaker is Jasper's last card, he expected that there would be undercover agents around, so he also arranged such a mysterious old man. By watching TV we can know: he is mute and won't reveal secrets, and others won't ask him or suspect him. Also, according to Huang Mei, Jia Si Mou's secretary, no one in the company knew knew him, where he came from or what his name was. Evidently, it was he who later found Jasper, rescued him and took care of him. Also, I do not know if you have noticed: that kitten, Jia Simou is entrusted to the old man watching the door.

2. It was someone who wanted to frame Jasmeo. Cue Jia, there's a word for west

3. Yes

The 21-episode TV series "Sinking Star Files" is based on a true story