One tedious summer, Do-ha, Ha-kyung's first love, reappears before her. The contract for the peanut house, which had been unsold, becomes entangled because of his name. A heated confrontation erupts, stirring up mutual wounds. Within the crumbling walls, long-buried memories resurface, and their summer rekindles.

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.

Ha-gyeong and Do-ha settle into a new living situation and continue working on the Patan High project. But their mutual rival Nam-jin causes trouble.

Memories resurface as a shooting star lights the sky. Past and present collide as a confession is evaded. The name Baek Do-yeong casts a long shadow.

Even if the peanut house collapses, the hearts of two people must be rebuilt. Unspoken truths, confessions of love spilling out like sleep talk. The moment when the true betrayer surrounding the solar power project is revealed. Two people standing together in the fight to protect their neighbors and village. "What will the model we will create in the future look like?"