She Would Never Know

Composer

• 
  Jung Se Rin

Director

• 
  Lee Dong Yoon

Screenwriter

• 
  Chae Yoon

Main Role

• 
  Won Jin A

  Yun Song A

  Main Role
• 
  Ro Woon

  Chae Hyeon Seung

  Main Role
• 
  Lee Hyun Wook

  Lee Jae Sin

  Main Role
• 
  Lee Joo Bin

  Lee Hyo Ju

  Main Role
• 
  Lee Kyu Han

  Lee Jae Un [Hyo Ju's brother]

  Main Role

Support Role

• 
  Wang Bit Na

  Chae Ji Seung [Hyeon Seung's sister]

  Support Role
• 
  Ha Yoon Kyung

  Chae Yun Seung

  Support Role
• 
  Lee Dong Ha

  Kang U Hyeon [Yun Seung's husband]

  Support Role
• 
  Park So Yi

  Kang Ha Eun [Yun Seung's daughter]

  Support Role
• 
  Choi Jung Won

  Ryu Han Seo [U Hyeon's friend]

  Support Role
• 
  Kim Seo Ha

  Kim Min Seong [Hyeon Seung's friend]

  Support Role
• 
  Park Han Sol

  Lee Se Rim [Hyeon Seung's friend]

  Support Role
• 
  Lee Ji Hyun

  O Wol Sun [Song A's mother]

  Support Role
• 
  Hey Jini

  Kim Ga Yeong [Song A's friend]

  Support Role
• 
  Ahn Se Ha

  Kwon Seong Yeon [KLAR Cosmetics]

  Support Role
• 
  Yang Jo Ah

  Yoo Jae Gyeong [KLAR Cosmetics manager]

  Support Role
• 
  Kim Han Na

  An Yu Seon [KLAR Cosmetics]

  Support Role
• 
  Kim Hye In

  Kang Su Mi [KLAR Cosmetics]

  Support Role
• 
  Jeon Gook Hwan

  Chairman Lee [Hyo Ju's grandfather]

  Support Role
• 
  Kwon Han Sol

  Do Ye Jin [Part-time worker]

  Support Role
• 
  Kim Kwang Gyu

  Kim Jong Hyeok [Restaurant owner]

  Support Role
• 
  Baek Sung Chul

  BM Seo

  Support Role
• 
  Park Sang Hyun

  Park Min Ji

  Support Role
• 
  Choi Woo Sung

  Ko Myeong Jin [KLAR Cosmetics intern]

  Support Role

Guest Role

• 
  Kang Bin

  [Model] (Ep. 1)

  Guest Role
• 
  Lee Seung Yeon

  [Cosmetics saleswoman] (Ep. 1)

  Guest Role
• 
  Lee Rang Seo

  [Photography studio assistant] (Ep. 1-2)

  Guest Role
• 
  Kim Baek Ri

  So Mi (Ep. 1, 8)

  Guest Role
• 
  Bae Gi Beom

  [Director] (Ep. 2)

  Guest Role
• 
  Seo Myung Chan

  [Chairman Lee's secretary] (Ep. 2)

  Guest Role
• 
  Song In Seop

  [Bartender] (Ep. 3)

  Guest Role
• 
  Lee So Geum

  [Hyo Ju's acquaintance] (Ep. 3)

  Guest Role
• 
  Lee Jang Won

  [KLAR Cosmetics employee] (Ep. 3)

  Guest Role
• 
  Kim So Min

  [Training assistant manager] (Ep. 3)

  Guest Role
• 
  Hong Ye Ji

  Min Jeong (Ep. 3, 11)

  Guest Role
• 
  Joo Yeon Ah

  [Hyo Ju's friend] (Ep. 3, 11)

  Guest Role
• 
  Kang Tae Woo

  Lee Jae Sin [Teen] (Ep. 4)

  Guest Role
• 
  Song Yo Sep

  [Scam victim] (Ep. 4)

  Guest Role
• 
  Yoo Yong

  [Jae Un's friend] (Ep. 4)

  Guest Role
• 
  Park Jin Young

  [Event hall staff] (Ep. 4)

  Guest Role
• 
  Yang Hee Won

  [Son of Yun Seung's friend] (Ep. 4)

  Guest Role
• 
  Shin Ian

  Lee Jae Un [Teen] (Ep. 4, 16)

  Guest Role
• 
  Im Sung Mi

  [Yun Seung's friend] (Ep. 4, 7)

  Guest Role
• 
  Kim Moon Ho

  Kim Do Gyeon (Ep. 5)

  Guest Role
• 
  Yoo An

  [Saleswoman] (Ep. 5)

  Guest Role
• 
  Kim Sun Hye

  [Saleswoman] (Ep. 5)

  Guest Role
• 
  Yeo Woo Rin

  [Cafe customer] (Ep. 5)

  Guest Role
• 
  Kim Chae Hyun

  [Department store manager] (Ep. 5)

  Guest Role
• 
  Heo Seon Haeng

  [KLAR Cosmetics sales employee] (Ep. 5)

  Guest Role
• 
  Myung Seok Geun

  [KLAR Cosmetics sales employee] (Ep. 5)

  Guest Role
• 
  Lee Eun Joo

  BM Choi (Ep. 6)

  Guest Role
• 
  Lee Yoon Gun

  Lee Se Dong (Ep. 6)

  Guest Role
• 
  Ahn Ji Hyeon

  [Shoplifter] (Ep. 6)

  Guest Role
• 
  Kim Jin Ok

  [Part-timer] (Ep. 6)

  Guest Role
• 
  Jo Eun Joo

  [Saleswoman] (Ep. 6)

  Guest Role
• 
  Choi Hwa Young

  [Assault victim] (Ep. 6)

  Guest Role
• 
  Kim Nam Jin

  [Market vendor] (Ep. 6)

  Guest Role
• 
  Bae Seong Il

  [Factory employee] (Ep. 6-7)

  Guest Role
• 
  Lee Kun Goo

  [Detective] (Ep. 6, 10)

  Guest Role
• 
  Shin Soo Hyun

  [Yun Seung's friend] (Ep. 7)

  Guest Role
• 
  Ahn Soo Bin

  [Yun Seung's friend] (Ep. 7)

  Guest Role
• 
  Park Se Ryeon

  (Ep. 7)

  Guest Role
• 
  Han Chae Kyung

  Han Seo Yeon (Ep. 8)

  Guest Role
• 
  Chae Hee Su

  [Hyeon Seung's alumni] (Ep. 8)

  Guest Role
• 
  Park Jin Soo

  [Hyeon Seung's alumni] (Ep. 8)

  Guest Role
• 
  Lee Chang In

  [Hyeon Seung's alumni] (Ep. 8)

  Guest Role
• 
  Lee Si Young

  [Cooking Studio attendee] (Ep. 8)

  Guest Role
• 
  Park Joo Young

  [Presenter] (Ep. 9)

  Guest Role
• 
  Kim Hong Pyo

  [Song A's father] (Ep. 9)

  Guest Role
• 
  Lee Na Yoon

  Yun Song A [Young] (Ep. 9-10)

  Guest Role
• 
  Park Jung Eon

  [OB/GYN] (Ep. 10)

  Guest Role
• 
  Yong Jin

  [Detective] (Ep. 10)

  Guest Role
• 
  Choi Eun Hwa

  [Interviewer] (Ep. 10)

  Guest Role
• 
  Han Seung Soo

  Jo In Gyeong (Ep. 10-11)

  Guest Role
• 
  Ha Nam Woo

  I Jun (Ep. 11)

  Guest Role
• 
  Kim Mi Kyung

  Mi Seok [Jae Sin's mother] (Ep. 11)

  Guest Role
• 
  Lee Young Shil

  [Restaurant owner] (Ep. 11)

  Guest Role
• 
  Woo Hyun Seo

  [Vlogger] (Ep. 12)

  Guest Role
• 
  Han Seung Yoon

  [Employee] (Ep. 12)

  Guest Role
• 
  Je Seung Hyun

  [Employee] (Ep. 12)

  Guest Role
• 
  Yoo Mi Sun

  [Employee] (Ep. 12)

  Guest Role
• 
  Kim Deok Ju

  [Housemaid] (Ep. 12)

  Guest Role
• 
  Kang Hyun Jung

  [Song A's ex-colleague] (Ep. 12)

  Guest Role
• 
  Song Hoon

  [Investor] (Ep. 14)

  Guest Role
• 
  Choi Seung Il

  [U Hyeon's father] (Ep. 14)

  Guest Role
• 
  Lee You Tae

  [Employee] (Ep. 15)

  Guest Role
• 
  Go Han Min

  [Jae Sin's co-worker] (Ep. 15)

  Guest Role
• 
  Kim Young Mi

  [Hyeon Seung's client] (Ep. 15)

  Guest Role
• 
  Park Hye Young

  [KLAR Cosmetics distributor employee] (Ep. 15)

  Guest Role
• 
  Ma Hyun Ji

  [Customer] (Ep. 16)

  Guest Role
• 
  Kim Chae Rin

  [Student]

  Guest Role
• 
  Jo Ah Jin

  [Bride-to-be]

  Guest Role
• 
  Kwon Chan Min

  [Jae Un's secretary]

  Guest Role
• 
  Kim Su Ol Guest Role

Unknown

• 
  Kim Ye Gyeom Unknown