Main Characters Kim Joon Hyuk / Kim Bum Gyoon (2037) 12 main appearances Han Jung Yun / Byul 12 main appearances Lee Ho Soo (2037) 12 main appearances Kim Woo Jin (2017) 11 main appearances Kim Bum Gyoon (2017) 11 main appearances Park Min Young (2037) 6 main appearances Circulate 3 Kim Woo Jin's Clone (2037) 2 main appearances