How to get to the ghost world?

When you turn on the Royal Sword flight system, you will see a "big map". In order to see whether Xue Jian's body is "in good condition", Jing Tian and others came to Shushan. ?

When you enter the senior disciple's room, you will find Zi Xuan and Solanum nigrum. After talking, they decided to go to Du Feng. ?

Go to the east bridge when you leave the room. You will meet sorbus sorbus and get poison beads. After Jing Tian refused to take Sobu to Du Feng, Sobu left angrily. ?

Use the Royal Sword to fly to Du Feng (in the upper right corner of the map, next to the boat and the Yangtze River).