Title: 선배, 그 립스틱 바르지 마요 / She Would Never Know
Also known as: Senior, Don’t Put on That Lipstick
Genre: Romance, Comedy
Episodes: 16
Broadcast network: jTBC
Broadcast period: 2021-Jan-18 to 2021-March-09
Air time: Monday & Tuesday 21:00 KST

Yoon Song Ah (Won Jin Ah) works as a marketer for a cosmetic brand. She enjoys her job and does it with vigor. Her dream is to start her own cosmetic brand. Meanwhile, Chae Hyun Seung (Ro Woon) works with Yoon Song Ah as a marketer. He becomes attracted to Yoon Song Ah and tries to develop a romantic relationship with her. However, Yoon Song Ah rebuffs his advances, because she does not see younger guys as dating partners.