In what year was the album “I'm Bad” released by NU'EST?

In what year was the album “I'm Bad” released by NU'EST?: The album “I'm Bad” was released in 2015 by NU'EST, featuring 2 tracks.
What is the most successful song from the album “I'm Bad” by NU'EST?: “I'm Bad” is the biggest hit from the album “I'm Bad” by NU'EST.

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