In what year was the album “Perfect Velvet” released by Red Velvet (레드벨벳)?

In what year was the album “Perfect Velvet” released by Red Velvet (레드벨벳)?: The album “Perfect Velvet” was released in 2017 by Red Velvet (레드벨벳), featuring 9 tracks.
What is the most successful song from the album “Perfect Velvet” by Red Velvet (레드벨벳)?: “피카부 Peek-A-Boo” is the biggest hit from the album “Perfect Velvet” by Red Velvet (레드벨벳).

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