I Born Different

Alex, a 26-year-old woman working at a business company to earn money and support her family, finds herself alone in the office late at night. She checks for errors in the documents, and then stops typing, and feels a shiver run through her body, realizing it is time to go to the bathroom.She thought she was the only one left alone on this company but there's another person approached at the restroom. Who could that person be that she was approached by?