Yu Shin-woo
Principal
Bong-soo's father
Grandfather from Kangwondo
Dong-sik
Seung-wan's father
Man-taek's grandfather
Chairman Lee Sam-goo
Choi Kyung-son
Choi Kyu-ha
Shi Yeon's Father
Ma Pa-ram
Company president Lee
박덕보
Uhm Hwi Jang