In the City of Eternal Night, memory tattoo artist Su Mian gets caught up in a bizarre suicide case and discovers she is a test subject in the “Silver Butterfly Project.” As police detective Lin delves into the case, the conspiracy comes to light: she is a clone, and her memories can be altered and reclaimed. With a second-generation subject closing in, Su Mian awakens through pain, joins forces with her companions to fight data tyranny, and searches for the ultimate answers about memory and human nature.