Min-hee, Da-hye, and Ye-ji, who were once classmates, are placed in different classes as they advance to the next grade. As their common interests gradually change, Min-hee begins to feel increasingly isolated. During a school trip to an unfamiliar place, she painfully realizes how distant she has become from the others. However, new friends start to show interest in Min-hee and approach her, naturally shifting the atmosphere. Like the color green, Min-hee's future feels fresh and full of hope.