Adult Trainee (Korean: 어른연습생) is a South Korean web series directed by Yoo Hak-chan and Jeong Hyeong-gun, starring Ryu Ui-hyun, Cho Mi-yeon, Jo Yoo-jung, Ryeoun, Kwon Young-eun, and Kim Min-gi.

A change comes when to save face, she convinces acquaintance Nam-ho (Ryeoun) to pretend to date her; she believes she has no interest in him, but to her surprise, she begins to be drawn to his wild and edgy nature.

The third and last part is the story of the mysterious J, who appeared in front of Na-eun (Kwon Young-eun), an overweight girl who has never received anyone's attention, and thus decides to find J's identity.

The series, directed by Yoo Hak-chan and Jeong Hyeong-gun, was first announced on October 13, 2021, with the release of a provocative teaser poster.

[5] The writers of the series, Kim Hyeon-min, Bang So-min, and Jin Yun-ju, won the CJ ENM's O'PEN contest, a project that supports new storytellers.