What you want to ask is why there are so many second-hand houses in Evergrande Yulan Bay? The reason for this is the following：

1. Regional congestion: Evergrande Yulan Bay is located in a densely populated area in a prosperous area, and there is a great demand for second-hand houses.

2. Changes in market demand: Changes in the purchase policy and economic situation have led to a decline in the demand for second-hand houses in Evergrande Yulan Bay and an increase in the number of second-hand houses.