Amber was a car lover and a dedicated member of a motor club in Hong Kong. She recently bought a Lamborghini. As a result, she would like to sell her existing Aston Martin Vintage Coupe (the Aston Martin). On Monday, Amber advertised her Aston Martin on car.price.com (a platform for buying and selling used cars) stating that Aston Martin Vintage Coupe in perfect condition. 2019 manufactured. First come, first served. Price negotiable. Amber provided her office number as the designated contact method. Since Amber needed to go to Tokyo for a short business trip, she asked her secretary to help her negotiate and sell the Aston Martin in case some potential customers called. A member of the same motor club, Silver could find Ambers personal contact information through the Motor club.

On Monday afternoon, Silver sent a letter to Amber, agreeing to buy her Aston Martin at the price of HK$1.7 million. Silvers letter was delayed and delivered only on Thursday.

On Wednesday, Silver emailed the following message to Amber at amber.rich@xmail.com: The deal is HK$1.7 million for your Aston Martin.

On Wednesday afternoon, Amber ran into her aunt in Tokyo. Knowing Ambers intention to sell her Aston Martin, Aunt Lilith told Amber that she would like to purchase Ambers car. Amber said: I can give you the car as a gift to repay your kindness in helping me refurnish my house last month.

On Thursday, Blue Smith saw Ambers advertisement and called the number provided. He stated that he would buy the car at the price of HK$1.8 million. Acting on behalf of Amber, the Secretary said: Deal! Ambers secretary also discussed the details of the transfer such as the payment details, the delivery date etc., with Blue Smith. Later that day, Amber returned home and found Silvers letter. She also noticed Silver had sent her an email. Meanwhile, Ambers young sister, Goldilocks, has tried the new Lamborghini. She loved the car and volunteered to be Ambers chauffeur, on the condition that Amber let her keep her green iguana, one type of lizards, at home. Amber said: No problem. Amber then regretted her decision as she discovered that a green iguana could grow up to 6.6 feet and could bite people in self-defense.

In Law of Contract, advise Amber if she has any contractual relationships with Silver, Blue Smith, Goldilocks and Lilith respectively