Ok so I kinda just went straight into the book without explaining Soo Min's background story, so here it is in a nutshell.
So basically he mum died when she was 14, (I'll go into more detail in chapters 3-5)
Her dad was a player and an alcoholic and decided to leave Soo Min at the age of 15 (again I'll go into more detail later in the story)
Soo Min lives with her grandma that is struggling to get money, hence Soo Min always working.
After her parents died she cut all ties with friends in and out of school including Kim Yoo Na.
She suffers from eating disorder and anorexia and tends to binge eat after not eating for a long period of time.
Her nickname is Snow White since her skin is very pale and she has jet black short hair.
She used to be a straight A student, but now because of her busy working hours she doesn't get much time to do schoolwork.

Ok that's all you need to know right now, I might do another one of these further on in the story with other characters and stuff. Thank you for reading and have an amazing day!