How to Be Thirty Season 1 “Not Yet 30” follows the lives of three female friends in their 30’s.
Seo Ji-Won (Jung In-Sun) is a popular webcomic writer. She visits the publishing company office of her webcomics. There, she meets her first love Lee Seung-Yoo (Kang Min-Hyuk). They knew each other in their middle school days. Lee Seung-Yoo now works as an assistant manager for a planning team at the webcomic publishing company. Meanwhile, Seo Ji-Won gets involved with Cha Do-Hoon (Song Jae-Rim), who is directing a movie that is based on her webcomic.
Lee Ran-Joo (Hani) works as an announcer. Hong A-Young (Cha Min-Jee) runs a cafe. One day, Hong A-Young’s ex-boyfriend appears in front of her. Meanwhile, Hyeong Joon-Young (Baek Sung-Chul) works part-time at Hong A-Young’s cafe. He has feelings for announcer Lee Ran-Joo and confesses his feelings to her.