"Henry and William were good friends from secondary school. Henry is now running his own business as a second-hand car dealer in Hong Kong. William is also a car lover and they met for a drink last week.

"I will be offer to Japan to see a second-hand car show this Friday, would you like anything from Japan?" William asked Henry.

"Great, please check whether there is any good value car and pick one or two for me anything below HK$1million will be fine.", Henry replied.

At the car show, William test-drove a Ronda Sports, he fell in love with it and promptly placed an order at a price of HK$560000. He paid HK$150000 deposit and arranged for the car to be shipped back to Hong Kong next month. He also told the seller that he was purchasing it on behalf of his friend Henry.

When returning to Hong Kong, William gave the details of the Ronda Sports to Henry. In order to cover his expenses in Japan, William claimed that the price of the car was HK$620000.

Henry found the car was not a good deal and wanted to deny the purchase."

give me a case law