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). [About:]She Would Never Know 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, it premiered on JTBC on January 18, 2021.[Source: Wikipedia]