In the future city "New Arc City", citizens can use "Forget River Technology" to selectively delete painful memories and build a perfect life. Ling Chen, a data archaeologist, is troubled by a recurring memory fragment that does not belong to him - a rainy night, piano music, and a vague silhouette of a woman. In order to find his "self", he embarked on a dangerous journey against the current. He will sneak into the dark side of the city where memory is strictly controlled, confront the creator of the technology, and uncover a shocking secret: when everyone chooses to forget, the truth becomes the most dangerous luxury. This is not only a pursuit of memory, but also a profound torture about human nature, love and redemption.
