- Yoo Ah-in (Han Se-joo / Seo Hwi-young)
- Im Soo-jung (Jeon Seol / Ryu Soo-hyeon)
- Go Kyung-pyo (Yoo Ji-no / Shin Yool)
- Kwak Si-yang (Baek Tae-min / Heo Young-min)
- Jo Woo-jin (Gal Ji-seok)
- Oh Na-ra (Secretary Kang)
- Yang Jin-sung (Ma Bang-jin)
- Jeon Soo-kyung (Wang Bang-wool)
- Kang Hong-suk (Won Dae-han)
- Ji Dae-han (Won Man-hae)
- Cheon Ho-jin (Baek Do-ha)
- Jo Kyung-sook (Hong So-hee)
- Seo Hye-jin (Ribera)
- Shim Min (Mi-young)
- Kim Seong-hoon (Lee Jeong-bong)
- Park Sun-im (Hanna Kim)
- Choi Seo-yeon (Seol's colleague)
- Cha Gun-woo (Yool's butler)
- Jung Yeon-joo (Bang-jin's colleague)
- Kim Hyun-sook (Dr. Soo)
- Cha Soon-hyeong (Japanese police)
- Jo Yeong-hoon (Veterinary surgeon)
Chicago Typewriter — S1E13
Episode: The Secret Agent
Air Date: 2017-05-26
Runtime: 70 min
Overview
Seol and Se-joo travel to the past and meet their past selves. After escaping the gunfight that broke out in Gyeongseong, Seol and Se-joo find out that there is a secret agent hiding among Joseon Youth Alliance. Meanwhile, Jo Sang-mi continues her plot against Seol, and Se-joo finds out that Sang-mi’s target is Seol, not him.