Back from a 2-year hiatus, Do-ha refuses defeat and attempts to win back Ha-gyeong's heart. Old memories from a summer past unlock as the rain pours.

The Patan High School Project reunites the two. Under the Summer Triangle, first love emerges once more as Do-ha reveals his heart to Ha-gyeong.

As secrets unfold, past grievances reach a breaking point. Do-ha and Ha-gyeong begin a long and arduous battle over her beloved Peanut House.