In Xinhai City, memories can be quantified, modified, and deleted. "Memory Tuner" Lin Mo is the city's top emotional surgeon. Calm and precise, he treats memory as a stream of data. Until one day, in a sad memory to be destroyed, he discovered a ghostly echo that did not belong to the client - a woman in a red dress desperately shouted "Escape" in the rain. This abnormal fragment invaded Lin Mo's world like a virus, forcing him to violate the iron law and embark on the taboo path of pursuing the truth. He will dive beneath the city's gorgeous façade of data and face the secrets swallowed up by the "Sea of Oblivion" as well as his own buried past.