Title: Your Secret Keeper
Sun has recently started a new job at a much better company than the one she is coming from. Having just gone through a traumatic and unfortunate scandal at her previous job, she's ready to work hard and put the past behind her… but that's hard to do when her new boss, Doyoung, is actually her first love from high school, which ended before it could even begin. He's as big of a jerk as he was in high school and seems to be intent on making Sun's life as hellish as possible until she quits.
Unwilling to be pushed out of another company, Sun spends her days drowning her sorrows in alcohol after work and doing her best to field all of Doyoung's unreasonable requests and criticisms. One evening, after some heavy drinking with her coworkers, she gets home to find a package by her door. It turns out to be for Doyoung, who lives in the building next to hers. In her drunken stupor, she resolves to bring the package to his apartment and give him a piece of her mind simultaneously.
To her surprise, after puking on him and being let into his apartment, she finds a streaming setup. He doesn't seem to be the kind of guy that would do that sort of thing, so she ends up perusing his computer while he is in the bathroom only to discover he does stream, but the subject matter is of the adult variety. With this newfound ammunition, Sun intends to use this to make life at work much more peaceful. Additionally, she finds herself attracted to Doyoung even more than she ever had in high school and establishes a sexual partnership with him in exchange for her secrecy.
As their relationship grows and she discovers more and more about the world Doyoung is part of, Sun finds herself falling deeper and deeper for him, but the sudden return of her ex-boyfriend threatens to ruin what little bit of trust she has built back up with Doyoung.