“How to Be Thirty” will be a relatable romance centering around the work and love lives of women who have just entered their 30s. The drama follows the story that unfolds when 30-year-old webtoon author Seo Ji Won meets her publisher Lee Seung Yoo, who is also her first love from middle school.

Jung In-sun, Hani, Cha Min-jee, Kang Min-hyuk, Song Jae-rim, Baek Sung-chul, Lee Chae-won, Kim Ji-sung