Conversation so far:
How did Shinee rise to popularity start?
The lead single, Ring Ding Dong, was released digitally on October 14 and charted atop of several Korean music charts and gained popularity all over Asia.
What is Shinee's Lucifer?
Lucifer is the second full-length album by South Korean boy band Shinee.

Question: When was Lucifer released?
Self-contained rewrite: When was Shinee's Lucifer album released?