What is the stem of a thousand seals?

Movie clips of miracle silly children. Jackson Yi used his mobile phone to pat the dust while filming "The Stupid Child Miracle". Wang Boxue, the film's director of photography, revealed that in order to convince the audience that Hao Jing, played by Jackson Yee, is a mobile phone repairman, Jackson Yee really studied to repair his mobile phone for half a month, in order to look like an amateur in front of the camera.