The court heard authorities were alerted to the scheme when the lavish lifestyle of a Portuguese man and his partner caught the attention of French authorities.
Speaking through an interpreter at the inquest in Kilrush, County Clare, Ms Huang, wiping away tears, asked: "What exactly caused Zhihan to fall from the cliffs?"Clare County Coroner Isobel O'Dea told the grieving mother that the evidence of an eyewitness would help answer that question.
A French tourist who witnessed him fall told Clare Coroner's Court she had seen him slip and try to pull himself up by grasping at grass, before he disappeared over the edge.French tourist Marion Tourgon told the inquest she had witnessed the fall at about 13:45 that day.Ms Tourgon explained she had been at the edge of the cliffs with her husband and two children, taking a selfie at the time.
She describing seeing a young Asian boy, who was alone, come into view."I saw him slipping in the puddle that appears in the photo that my husband sent to the police," the witness said.
"His right foot slipped into the puddle, with him trying to stop himself from falling with his left foot but his left foot ended up in the air."
Ms Tourgon added: "It was very quick - he found himself in an awkward position with his left foot in a void over the cliff and his right knee on the edge of the cliff."Forecasters said the conditions were expected for much of Saturday before fading from the west during the mid to late afternoon.
The warning covers the whole of Devon and spreads into East Cornwall including Bude, Launceston and Callington.The Met Office said more persistent rain and showers would arrive in the South West on Friday evening before heading to the east overnight.
Its forecast added it would become windy in the South West by dawn on Saturday.The Met Office said 10-15mm (1-1.5cm) of rain could fall in less than an hour while some areas could have 30-40mm (3-4cm) of rainfall over several hours with "successive showers and thunderstorms".