Not Yet Thirty) is a South Korean streaming television series starring Jung In-sun, Kang Min-hyuk, Ahn Hee-yeon, Song Jae-rim, Cha Min-ji, Baek Sung-chul, and Kim Ji-sung.

Based on the webtoon Something About 30 by Hye-won, it premiered on KakaoTV on February 23, 2021, with a new episode being released every Tuesday and Saturday at 17:00 (KST).

In late August 2019, it was announced that the KakaoPage webtoon Born in 1985 by Hye-won would be adapted into a web series.

[5] On August 11, 2020, Jung In-sun, Kang Min-hyuk, Ahn Hee-yeon and Song Jae-rim were confirmed to star in the series.

[6] The series, titled as How to be Thirty, is available with multilingual subtitles on iQIYI (iQ.com) in South East Asia, Hong Kong, Macau and Taiwan.