Sanaedeokjilgeumji

Hae-Young is a perfect career woman at work, but lives the life of a thoroughly hidden otaku after work. Her peaceful double life begins to shake due to a handsome cosplayer she encounters at a weekend game event. The identity of the flashy cosplayer is Ju-Yeon, a nerd who is always quiet and inconspicuous at work! The two who have never exchanged a single word with each other end up sharing a secret against their will, and Ju-Yeon makes an unexpected offer to Hae-Young, who asks her not to reveal it at work...

Will this relationship be safe until the end?

(Source: Ridibooks, translated)