Once the family conflict is resolved, the Key reappears, they open the Door, and leave the level. After opening the Door, Jiu Shi gets a clue about the next level, which is Fitcher’s Bird. In the real world, they are gone for only 15 minutes. Jiu Shi meets the Obsidian team but opts not to join. Bai Jie is actually Ruan Lan Zhu, who leaves to complete another door and comes back severely injured. (Source: frankly at MyDramaList)