3 Minute Heroes: Card Defense

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The brand new hero, 'Librarian' has been updated!
- Librarian is an intelligent hero who freely writes and erases keywords on the cards.
- Librarian's choir skin has been updated.
- New package product that includes librarian, choir skin and 5 hero scrolls has been added.

Data optimization work has been done.
The issue that the app ends abnormally has been resolved.