What you want to ask is "which entrance of Cuiwei Department Store is at Peony Garden Subway Station"? It's at the exit A of Mudanyuan subway station.

Mudanyuan subway station is one of the important stations of Beijing subway network. Mudanyuan subway station has four exits, namely Exit A, Exit B, Exit C and Exit D.. Near Exit A (northwest exit): Cuiwei Department Store Peony Garden Store, Beijing Nokia Customer Service Center, KFC and Bank of China.