Jeon Do-yeon as Song Jung-yeon

Go Soo as Im Jong-bae

Kang Ji-woo as Hye-rin

Choi Min-cheol as Seo Moon-do

Lee Dong-hwi as Gwang-sik

Park Ji-hwan as Tae-gwang

Seo Jin-won as Sang-chul

Choi Gwi-hwa as Detective from Seoul Prosecutor's Office

Corinne Masiero as Hellboy

Joanna Kulig as Yalka

Heo Joon-seok as Soo-Jae

Bae Sung-woo as Korean Embassy Employee

Kim Hae-gon as Proxy Driver Client

Lee Min-woong as Korean Embassy Employee 1

Dong Hyo-hee as Jong-bae Older Sister

Jang Gwang as Ambassador to France

Choi Young-woo as Broker

Park Jae-cheol as Student

Kim Hyun-min as jjimjilbang (sauna) counter

Oh Yeon-ah as Su-ji

Kang So-yi as Post office worker