She Would Never Know

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 (Elize), it premiered on JTBC on January 18, 2021.

Synopsis
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's relationship with her closeted husband, Kang Woo-Hyun and their young daughter, Kang Ha-Eun.

Main

 * Won Jin-ah as Yoon Song-ah
 * a senior at KLAR cosmetics 2 years elder in work experience and 1 year elder in age from Hyun seung. She was in a relationship with BM Lee Jae-shin for 2 years.


 * Rowoon as Chae Hyun-seung
 * an intern who started to like Song-ah on their first encounter itself. He was the first one to know about Song-ah and BM Lee's relationship.


 * Lee Hyun-wook as Lee Jae-shin
 * BM secretly dating Song-ah for 2 years but is engaged to Lee Hyo-joo.


 * Lee Joo-bin as Lee Hyo-joo
 * BM Lee Jae-Woon's sister; grand-daughter to the owner of the cosmetic company; engaged to BM Lee Jae-shin.


 * Lee Kyu-han as Lee Jae-woon
 * a BM at the cosmetic company, grandson to the owner of the cosmetic company; starts dating Chae Hyun-seung's sister Chae Ji-Seung.


 * Wang Bit-na as Chae Ji-seung
 * Chae Hyun-seung's sister; a high-end wedding dress maker; starts dating BM Lee Jae-woon

Supporting

 * Park Han-sol as Lee Se-rim, Chae Hyun-seung's friend
 * Park So-yi as Kang Ha-eun, Chae Yeon-seung's daughter
 * Choi Jung-won as Ryu Han-seo
 * Lee Dong-ha as Kang Woo-hyun
 * Ha Yoon-kyung as Chae Yeon-seung, Chae Hyun-seung's sister
 * Lee Ji-hyun as Oh Wol-son
 * Kang Hye-jin as Kim Ga-young
 * Ahn Se-ha as Kwon Sung-yeon, one of Chae Hyun-seung's co-workers
 * Yang Jo-ah as Yoo Jae-gyum
 * Kim Han-na as Ahn Yoo-sun
 * Kim Hye-in as Kang Soo-mi
 * Kwon Han-sol as Do Ye-jin
 * Kim Kwang-kyu as Kim Joong-hyuk
 * Kim Min-gwi as Model
 * Jeon Gook-han as Chairman Lee

Original soundtrack

 * Part 1


 * Part 2


 * Part 3


 * Part 4


 * Part 5


 * Part 6


 * Part 7

International broadcast
The series is available for worldwide streaming exclusively on iQIYI at the same time as the episodes air on JTBC in South Korea, with subtitles in Chinese, English, Thai, Bahasa Malaysia, Vietnamese, Indonesian, Spanish and Arabic.