Hello,
This issue where Illium characters cannot complete 3rd Job Advancement due to NPC Shuang's disappearance has been reported to the team.
Thank you!
[Update 6:15 PM PDT] We are deploying a server-side hotfix at 6:15 PM PDT (9:15 PM EDT / 3:15 AM CEST Jun 11 / 11:15 AM AEST Jun 11), which is expected to last approximately 10 minutes. While MapleStory will remain active during this time, some game functions, including logging into MapleStory and changing characters, will be unavailable. Thank you for your patience.
We are currently investigating the issue where the Aurora world would constantly crash.
In order to avoid further rollbacks of player data, Aurora will temporarily be down.
We will update when we can. Thank you for your patience.