S1, E4: Young Shin and her friends have a great time on the school field day, sharing food and taking pictures. When Young Shin whispers a secret to Se Jin, everything starts to go downhill. Min Gyung can’t stand how Sook Jung is treating her, acting like she’s her boss. Meanwhile, Jung Hoon comes to school in the cold without a jacket. Wan Soo calls Gyung Chul to school.