When Haseul is forced to spend her summer in her grandmother's beach house, she expects nothing to happen- like usual. But small seaside towns hold more adventure and love than Haseul could have possibly imagined, and maybe she learns more than she ever could have in school. this is a loona 1/3+yeojin centric high school summer viseul au  

Or, eleven times Haseul helped her friends, twelve times Vivi helped Haseul, and one time Haseul's friends helped her, for once.