Episode 5 S01 E05

Hyun Bin (as Goo Seo-jin / Robin) Han Ji-min (as Jang Ha-na) Sung Joon (as Yoon Tae-joo) Lee Hye-ri (as Min Woo-jeong) Lee Seung-joon (as Gwon Young-chan) Han Sang-jin (as Ryu Seung-yeon) Shin Eun-jung (as Dr. Kang Hee-ae) Lee Duck-hwa (as Chairman Goo Myeong-han) Kim Do-yeon (as Han Joo-hee) Kwak Hee-Sung (as Seong Seok-won) Lee Se-na (as Choi Seo-hee) Kim Kyung-Jin (as Director Kim) Lee Jun-hyeok (as Detective Na Moo-jin) Lee Won-keun (as Lee Eun-chang) Oh Na-ra (as Cha Jin-joo) Maeng Sang-hun (as CEO Min) Moon Young-dong (as Park Hee-bong) Choi Soo-han (as Robin (Young)) Heo Jung-eun (as Jang Ha-na (Child)) Jung Ji-so (as Jang Ha-na (Young)) Hwang Min-Ho (as Ahn Seong-geun) Jin Hyun-kwang (as Jeong Man-sik) Do Sang-woo (as Yoo Tae-joon) Kim Ji-eun (as Chairman Goo's secretary)

love triangle romance mental illness double identity psychological based on webcomic or webtoon sentimental quirky