Lian, a 30-year-old running a perfume business in the US, is searching for an assistant when she meets Eunseo, a young student studying abroad. Despite their significant age difference and Eunseo's bold flirting from the start, they end up going to a hotel together. Once there, Eunseo reveals a shocking secret and begins to slowly strangle the terrified Lian. How will their dangerous yet irresistible relationship unfold? A spin-off of 340 Days of Grace