Kim Hwan-hee as Im Hwi, Eun-seob's adoptive little sister.[8] Nam Gi-ae as Yoon Yeo-jeong, Eun-seob's adoptive mother.[9] Kang Shin-il as Im Jong-pil, Eun-seob's adoptive father.[3] Kang Jin-hwi as Kim Gil, Eun-seob's father.