I am staying at CITIC Hotel near capital airport. What subway line do I take to Forbidden City?

From the hotel, you can take free shuttle bus to arrive at the airport first. Then take Airport Express to Dongzhimen Station first. It takes around half an hour on the way. The ticket fare is CNY 25 per person. Then take metro line 2 to Jianguomen Station and then line 1 to East Tiananmen Square, Exit A. After wards, walk north around 0.5 miles (one kilometer).

Thank you!