Looking for advice from experts in the law, is this considered taking advantage of others’ danger?

According to your description, Shen’s behavior does not constitute taking advantage of others’ danger.

The transaction was concluded at a price of 180,000, which was the result of negotiation between the two parties. It was conducted on the basis of voluntariness of both parties. There was no other malicious coercion, and the market price of automobiles, as a consumable large product, changes rapidly. Fast. If you sell the car at a price lower than the purchase price, it cannot be considered a low price. Factors such as the condition of the car must be taken into consideration. Therefore, Shen does not need to return the car and bear liability for compensation.

In this case, Jiang was very dishonest and acted bravely when he saw justice.