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

In what year was the album “RBB” released by Red Velvet (레드벨벳)?: The album “RBB” was released in 2018 by Red Velvet (레드벨벳), featuring 6 tracks.
What is the most successful song from the album “RBB” by Red Velvet (레드벨벳)?: “Butterflies” is the biggest hit from the album “RBB” by Red Velvet (레드벨벳).

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