Cha-yoon holds a strong love for his childhood friend, Kim Seo-jin. Despite trying to keep his feelings at bay, the more he is around her, the more intense his longing becomes. Every night, Cha-yoon stealthily takes a kiss from Seo-jin's lips. Her mere presence ignites a deep desire within him, leaving him wondering if he can handle the overwhelming emotions the summer brings. Note that the main plot carries an R15 rating, while the side stories are rated R19.