Shen Nian appears to be an ordinary clerk at Gu Group, but in reality she is the world's top hacker, "X," a mysterious designer known as "Night," and a genius surgeon. Pressured by her own mother with threats of death, she enters a whirlwind marriage with Gu Hanzhou, CEO of Hanjing Tech. She thinks he's just an ordinary entrepreneur, while he thinks she's just a low-level employee. Then she discovers the firewall code she wrote three years ago in his study, and he traces the signal from "X" to his own home. Each harbors secrets, and they test each other. As their secret identities are stripped away one by one, and his desperate campaign to win her back begins, Shen Nian finally discovers that her whirlwind-marriage husband is the leader of the "Dark Night" organization she has been investigating all along.
