Eighteen-year-old Metawin Opas-iamkajorn's family is one of the wealthiest in all of Phuket. Bright Chivaaree's family too. Win's father loathed the latter's family. Aside from that, Win is gay too on which the society doesn't approve yet. The two are drawn with each other despite all the reasons they shouldn't be, and despite what each of them is hiding. Will they find love, acceptance, peace, or pain in once upon a summer?