What are Underlands? What are Underland Hubs?

✪ Buildings ‧ Builders' hub ‧ Park

If I delete an account, will the transactions associated with it also be deleted?

✎ Multi-Accounts & Advanced Settings

After logging in, some of my data is missing. ( ⚠️Please don't delete the app before resolving the issue! ⚠️)

☼ Data Sync

How can I increase "happiness"? Currently my happiness level is at 0.

✪ Prosperity ‧ City Hall ‧ Happiness

A heart symbol has appeared above a citizen's head. What is that? What does "happiness" refer to and how can I get it?

✪ Prosperity ‧ City Hall ‧ Happiness

Can't log in, can't recover data (the pencil icon loads for a long time without logging in)

☼ Data Sync