A journey of anger, a farewell ten years late. That Christmas, she went to Malta out of anger with a strange man. The blue of the Mediterranean is overwhelming, and the rocks with blue windows are silent in the sea breeze - she just wanted to get revenge on her boyfriend, but she didn't expect that this trip would leave a shadow in her heart for ten years. He is Liu Ci, an ordinary person working in Poland. He is unemployed, depressed, and talks about "death". During the four days in Malta, he took pictures of her, walked with her throughout Valletta and Gozo, and asked her "can you stay with me" at the blue window. She refused because of fear, because of reality, and because she felt that he was too heavy. She didn't even respond to every subsequent text message he sent. Ten years later, Liu Ci left. His cousin handed her a photo album - full of photos he had taken of her in Malta that year. She returned to Malta with this photo album, walked on the road she had walked before, ate the pizza she had eaten together, and on that heartbreakingly blue seaside, she finally admitted that she had missed something and would spend her whole life regretting it. This book is for everyone who has ever pushed their true heart away. Some love, if not expressed, becomes a regret; some people, as soon as they turn around, it becomes a lifetime.