She Would Never Know (Korean: 선배, 그 립스틱 바르지 마요) is a South Korean television series starring Won Jin-ah, Rowoon, Lee Hyun-wook, Lee Joo-bin, and Lee Kyu-han. Based on the 2017 web novel Senior, Don't Put on That Lipstick by Elise (Elize), it premiered on JTBC on January 18, 2021.

The series tells the story of people working on the marketing team of a cosmetics brand, with a focus on the senior/junior relationship of Yoon Song-ah (Won Jin ah) and Chae Hyun-seung (Rowoon). Substories include Chae Hyun-seung's sister, Chae Ji-Seung a dress maker, dating Lee Jae-Woon, a BM at the cosmetics company and his other sister, Chae Yeon-Seung, relationship with her closeted husband, Kang Woo-Hyun and their young daughter, Kang Ha-Eun.

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