Kim Taeyeon was no fool. In fact, she was one of the cleverest people in all of Busan. The love of her life, Jessica Jung, was no less. The two of them lead untraceable and peaceful lives. 

Taeyeon had unanimously been given the crown of the "Underground Queen." and with great power came great responsibility. She often left home and Jessica to go on her endeavours and always came back, exhausted, to an equally weakened Jessica who always welcomed her with a warm embrace. 

However, on one unsuspecting night, she comes back to nothing but a dusty bed. 

And that's when her world comes tumbling down.