Hypnosis isn't like what they show on TV, where you wave a pocket watch in front of someone and they obey the hypnotist, even giving away their bank account password. That's pure nonsense; it's not that magical.
Hypnosis is a process that guides a person into a state of consciousness. This technique can both heal and harm. In a past life, Qian used her identity as a doctor to target Ni Jianren in prison, ultimately causing the scumbag's downfall.
The first step is to relax the whole body and concentrate the consciousness. The tone and speed of speech are crucial. In her past life, Qian experimented many times before finding the right speech speed to help Zheng Xu focus, as he was not the type who was easily hypnotized.
"...Feel your calves relax; you can't even feel your legs' existence... You can only hear my voice now. You're at the seaside; seagulls are flying in the sky; it's very relaxing and comfortable..."