Han So-ran, who doesn't have a single friend in the real world, her only true friend is 'ke-SORAN' who lives in Kwangya. One day, she accidentally encounters her ex-boyfriend who broke up with her by ghosting her four years ago, and he was living in the so-called "Analog Mode" as he does not use a smartphone or SNS. The secret that So-ran and ke-SORAN who lives in both Kwangya and the real world that cannot be told to Cha Do-kwang starts to be dug up.

Ji Hoon and So Young have been best friends for the past 10 years. Ji Hoon, who had had a crush on So Young for n years, decided to confess her! Is there a suspicious person next to So Young?! A romance fantasy that takes place at the KB Kookmin Bank Gwangya branch.