In August 2013, the massively multiplayer online role-playing game (MMORGP) DragonNest suffered a data breach that was later redistributed as part of a larger corpus of data. The breach exposed over 500k unique email addresses along with usernames, IP addresses and plain text passwords. The service later suffered a massive data loss.
Source: HaveIBeenpwned
Source Link: https://haveibeenpwned.com/PwnedWebsites#DragonNest