Episode 8 S01 E08

L (as Sung Yi-gyum) Kwon Na-ra (as Hong Da-in) Lee Yi-kyung (as Park Chun-sam) Lee Tae-hwan (as Sung Yi-beom) Jo Soo-min (as Kang Soon-ae) Ahn Nae-sang (as Jang Tae-Seung) Choi Jong-won (as Kang In-Chung) Son Byung-ho (as Kim Byeong-Geun) Chae Dong-hyeon (as Kim Man-Hee) Park Joo-Hyung (as Seo Yong) Kim Ju-Young (as Sa-Wol) Shin Ji-hoon (as Choi Do-Gwan) Han Eun-seong (as Kang Jong-Gil) Lee Sang-un

corruption secret agent inspector historical sibling undercover operation hidden identity fight for justice joseon dynasty (1392–1910)