Namchin Isseum

Hyojoo can't wait to finish school and graduate into adulthood. Gunta, her annoying brother on paper, knows she has a past that still haunts her. They may live under one roof, but share nothing else - until summer break arrives with a rush of charming possibilities and new faces. Love or lies, Hyojoo may have to choose...
(Source: Tappytoon)
Includes prologue and a two chapter side story.