Behind the Glasses [BTS fanfic?]

The story is about this 21 year old young lady, Lee Seoyeon, who wishes to be a fashion designer. She's working at two jobs per day and all her free time she spends on her hobby, making or designing clothes. Even though she takes care of her little sisters, Jimin (14yo) and Jiwoo (8yo), everyday, this lady still somehow manages to design clothes of her own. The designs always go everywhere with her in her small leather bag/portfolio.

One day, when she was walking home, she faints due to huge lack of sleep. A handsome stranger decides to help her and brings her to the closest hospital. She wakes up in a shock when her leather bag/portfolio is open in front of her. Someone has looked at her designs and left a small sticky note with a number...