Why am I the Second Male lead?

Mae finally graduates and is exhausted thinking she's going to have to find a job to support her mother.

But before she could, she dies and wakes up in the body of Mason, a boy alienated by his own family and also the second male lead of a story she read to relax.

She only ever wanted to take care of her mom, but what could she do when she's stuck in the body of a fictional character...?

Not gonna be bl