On February 21, 2021, Big Hit Entertainment released 2 teaser images for their upcoming girl group JGT's first sub unit JGT V. They're individual teaser of members Yerin and Leena.

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On February 22, 2021, Big Hit Entertainment released 2 more individual teaser images of members Serena and Mihi.

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On February 23, 2021, Big Hit Entertainment released a individual teaser image of final member Lia along with a group teaser image. On top of that, they dropped the first MV teaser for their debut song called Jungle.

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On February 24, 2021, Bug Hit Entertainment released the second and with that final MV teaser for JGT's debut song 'Jungle'.