1948, Nanjing. The code-breaker codenamed "Abacus" silently discovered a piece of top-secret intelligence, and the deciphered coordinates pointed to a ruins that had already been blown up. At the same time, Su Jing, a performance artist who is good at disguise, suddenly appears. Every move she makes seems to imply that she is being monitored silently. The two tested each other in a cat-and-mouse game, only to discover that they were both outcasts on the high-level chessboard.
