Ji-young (played by Kim Sae-byuk) is a protagonist in The First Lap.
Su-hyeon (played by Cho Hyun-chul) appears in The First Lap.
Ji-young's Mother (played by Jo Kyung-sook) appears in The First Lap.
Ji-young's Father (played by Ki Joo-bong) appears in The First Lap.
Su-hyeon's Father (played by Moon Chang-gil) appears in The First Lap.
Min-hyeok (played by Jeong Do-won) appears in The First Lap.
Su-hyeon's Mother (played by Kil Hae-yeon) appears in The First Lap.
