Kim Ban Di

When Jo Gang-Ja attended high school, she was notorious for fighting. She gave birth to her daughter A-Ran in her late teens and became more responsible. Her daughter A-Ran is now a high school student, but A-Ran is bullied at school. Jo Gang-Ja decides to go back to high school to protect her daughter. Jo Gang-Ja becomes a high school student again.

Jo Jin-Gab was once a promising judo athlete. He protested against corruption at a game and he was kicked out of the sport. After that, Jo Jin-Gab became a gym teacher. Again, he could not control his anger against the son of the school's chairman. Jo Jin-Gab was once again kicked out of his profession.

Je Gal-gil causes an unprecedented scandal after he loses a match that he almost won due to the referee’s biased call and injures his leg. Even though permanently expelled from the national team as a player, he overcomes the trauma and comes back as a sports psychology counselor also called a mental healthcare coach. Together with the retired masters, Gal-gil works to help athletes who are going through a hard time as he did in the past.