Astounded by Eun-gyeol's candid love confession for Se-gyeong, Yi-chan retaliates with a spirited punch. Eun-gyeol's attempts at self-defense lead to Yi-chan having a bleeding nose on both sides. The schoolyard transforms into a battleground as students try to intervene, and the entire situation gains momentum. Se-gyeong (actually Eun-yu) is left in shock by the unexpected confession. Meanwhile, Eun-gyeol uncovers a hidden secret about Chung-ah.