Complete The Origin of the Lanterns.
Mengmeng seems to be troubled by something…
- Talk to Mengmeng
- Follow Mengmeng to meet Yu
- Hang Xiao Lantern
- Help Yu clean the shop
Talk to Mengmeng / Hang Xiao Lantern
Accept the quest from the Event Section, then speak to Mengmeng who can be found nearby the Statue of The Seven to the south of Stone Gate. After the conversation has come to a close, follow the path south and speak with Yu before climbing up to the top of the building via the tent and hanging up the Xiao Lantern.
Speak with Yu again, then run around the building whilst using an Anemo Character to get rid of the dirt. Finally, talk to Yu and Mengmeng to bring this quest to a close.