In what year was the album “To. Heart” released by fromis_9?

In what year was the album “To. Heart” released by fromis_9?: The album “To. Heart” was released in 2018 by fromis_9, featuring 6 tracks.
What is the most successful song from the album “To. Heart” by fromis_9?: “To Heart” is the biggest hit from the album “To. Heart” by fromis_9.

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