Please help me. Which line should I take from Beijing South Railway Station to Vientiane Xintian Phase IV in Chaoyang District by subway? Please let me know the transfer route.

Bus route: Metro Line 4 → Metro 1 Line → Batong Line →506 Road, with a total length of about 25.5 kilometers.

1. Walk about 70 meters from Beijing South Railway Station and arrive at Beijing South Railway Station.

2. Take Metro Line 4, pass 4 stops and arrive at Xidan Station.

3. Walk about 2 10 meters and transfer to the subway 1 line.

4. Take the subway 1 line, cross the station 10 and arrive at Sihui East Station.

5. Take Batong Line, pass 3 stops and arrive at Shuangqiao Station.

6. Walk about 70 meters to Shuangqiao West Station.

7. Take bus No.506, pass 5 stops and arrive at Changying Station.

8. Walk about 50 meters and arrive at Xintian District 4 in Vientiane.