krystal is scenario write, her age already 30. but her memories of high schools still pop in her head everytimes she alone. and then her friend, hyeri force her to go to reunion, make she should meets again with all her's ex crush!!! makes she meets again with someone who make her's heart deep in pain, but that someone's name also still inside in her heart until now. this story inspired of kdrama 'reply 1995' but the story, storyline, and etc is different. the main character of this s