In Huanhai City, where memories can be extracted, traded and tampered with, top memory appraiser Lin Chen is known for his calmness and accuracy. He can see through the authenticity of any memory, but cannot piece together the fragments of his past. One day, a mysterious woman named Xiaotong brought a blank memory crystal that could not be read, breaking his peaceful life. This crystal is like a stone thrown into the deep sea. The ripples it caused not only involved Lin Chen in a huge conspiracy about the dark truth behind memory technology, but also gradually led him to his forgotten past. In this city where truth and falsehood are hard to distinguish, he must sail across the ocean of oblivion to find his own island called truth.