My Step Brother with Insomnia

Y/N & Jin are Step siblings , Y/N is 17 & Jin is 18 . Both don't hate each other but don't even like each other. One day Y/N finds out that her step brother is having Insomnia , she tries to help him but ends up making him fall for her . Things dosen't go well after this , but now Jin can't loose her after his mother.....