In what year was the album “mono.” released by RM?

In what year was the album “mono.” released by RM?: The album “mono.” was released in 2018 by RM, featuring 7 tracks.
What is the most successful song from the album “mono.” by RM?: “moonchild” is the biggest hit from the album “mono.” by RM.
What are the main songs from the album “mono.” by RM?: The main songs from the album “mono.” by RM are “moonchild”, “forever rain”, and “seoul”.

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