On April 3, 2017, Big Hit Entertainment released 3 individual teasers of members Lia, Lianne and Eunseol. This marks as well the 3rd sub unit debut of member Lia.

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On April 4, 2017, Big Hit Entertainment released 3 more individual teasers of members Miso, Soeun and Jinny.

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On April 5, 2017, Big Hit Entertainment released a individual teaser for final member Lily and a group teaser.

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On April 6, 2017, Big Hit Entertainment released a MV teaser for JGT Rosy's debut with the Song Tag Me.