Why Didn’t I Tell You a Million Times?

Composer

• 
  Kono Shin

Director

• 
  Kaneko Fuminori
• 
  Yamamuro Daisuke

Producer

• 
  Isoyama Aki

Screenwriter

• 
  Adachi Naoko

Main Role

• 
  Inoue Mao

  Soma Yui

  Main Role
• 
  Satoh Takeru

  Torino Naoki

  Main Role
• 
  Matsuyama Kenichi

  Uozumi Yuzuru

  Main Role

Support Role

• 
  Shim Eun Kyung

  Song Ha Yeong

  Support Role
• 
  Itakura Toshiyuki

  Higuchi Masamichi

  Support Role
• 
  Karina

  Ozaki Rio / Ishioka Miyako

  Support Role
• 
  Shunputei Shota

  Hirota Masaru

  Support Role
• 
  Sakura Ichika

  Hirota Mikiko

  Support Role
• 
  Arakawa Yoshiyoshi

  Ikezawa Eisuke

  Support Role
• 
  Hiraiwa Kami

  Uozumi Kanae

  Support Role
• 
  Shoji Yusuke

  Tajima Koichi

  Support Role
• 
  Hoshi Moeka

  Muranaka Nozomi

  Support Role
• 
  Kondo Chihiro

  Takahara Suzuka

  Support Role
• 
  Arai Miu

  Soma Yui [Young]

  Support Role
• 
  Sakamoto Manato

  Torino Naoki [Young]

  Support Role
• 
  Osugi Mayu

  Uozumi Mana

  Support Role
• 
  Kinoshita Eita

  Uozumi Shota

  Support Role
• 
  Nagatomo Ikuma

  Nakamura Daichi

  Support Role
• 
  Kanno Misuzu

  Muto Chiyo

  Support Role
• 
  Nagashima Keizo

  Tanaka Kinari

  Support Role
• 
  Nakawaki Mikito

  [First Investigative Division Chief]

  Support Role

Guest Role

• 
  Sota Ryosuke

  Hashimoto Kento ["Hachidori" waiter] (Ep. 1)

  Guest Role
• 
  Kinoshita Suzuna

  [Yui's customer] (Ep. 1)

  Guest Role
• 
  Ishige Kouki

  Kiuchi Hiroto (Ep. 1-2, 4, 8-9)

  Guest Role
• 
  Miura Kira

  Kiuchi Kaito (Ep. 1-2, 4, 8-9)

  Guest Role
• 
  Anzai Seira

  Ozaki Rio [Young] (Ep. 2, 5-7)

  Guest Role
• 
  Terada Muroran

  [Man who wants to visit "Hachidori"] (Ep. 2)

  Guest Role
• 
  Aijima Kazuyuki

  Torino Yukihiko [Naoki's father] (Ep. 3-5, 10)

  Guest Role
• 
  Morita Minato

  Torino Takumi (Ep. 3)

  Guest Role
• 
  Nagano Satomi

  Torino Kaori [Naoki's mother] (Ep. 3, 5, 10)

  Guest Role
• 
  Hasegawa Hatsunori

  Ishioka Seijiro (Ep. 3, 5-7)

  Guest Role
• 
  Sakata Masanobu

  Sakata Yasushi [Lawyer] (Ep. 5)

  Guest Role
• 
  Sato Hinata

  Yamazaki Rika (Ep. 5-8)

  Guest Role
• 
  Nakashima Runa

  Takahara Suzuka [Young] (Ep. 5-6)

  Guest Role
• 
  Morimoto Nobu

  [Funeral staff] (Ep. 5)

  Guest Role
• 
  Moriya Biyori

  [Quiz event MC] (Ep. 5)

  Guest Role
• 
  Sekiguchi Ao

  [Ferris wheel staff] (Ep. 5)

  Guest Role
• 
  Aiba Seira

  [Girl coming to Chiyo's house] (Ep. 5-8)

  Guest Role
• 
  Ebina Ruka

  [Girl coming to Chiyo's house] (Ep. 5-8)

  Guest Role
• 
  Kikuchi Rinko

  Harada Yayoi (Ep. 6-8)

  Guest Role
• 
  Ikeda Satoshi

  [Apartment manager] (Ep. 6)

  Guest Role
• 
  Kikawa Junichi

  [Doctor] (Ep. 7)

  Guest Role
• 
  Hayase Mia

  [Girl coming to Chiyo's house] (Ep. 7)

  Guest Role
• 
  Hashimoto Keiichiro

  [Juvenile detention center staff] (Ep. 8)

  Guest Role
• 
  Aoki Yuzu

  Torino Takumi [Adult] (Ep. 10)

  Guest Role