Ai Li'er, a mysterious jellyfish, unexpectedly shares her heart with coffee shop owner Zhou Qiusheng. As Zhou Qiusheng and his friend, Chen Qingfeng, search for answers, Zhou Qiusheng’s ex-girlfriend, Lin Shuangshuang, struggles with the situation, while the truth behind Ai Li'er’s identity remains unclear.
A beautiful, innocent village girl and a rich, cold-hearted man find themselves married because of their family, who secretly engaged them when they were young.
Neuroscientist Shan Yu discovers the sudden death of his first love, Min Ying. Before she died, she clutched a birthday candle in her final moments. Lighting the candle, Shan Yu miraculously travels back ten years, and attempts to alter their fate. However, each journey he takes inadvertently triggers unforeseen consequences, and a decade-long hidden love story is gradually unveiled…