Please Throw Me Away

Adele was adopted in replacement of a lady who died from a rare disease. She worked her entire life so she would be loved, but as soon as her younger sister was born, she was abandoned. Then on Adele’s way to an arranged marriage, she was assassinated by mysterious enemies.
“…Is this a dream?”
But when she opened her eyes, she returned to 3 years in the past!
Since she is destined to be abandoned when her younger sister is born, this time around, she tries to live the way she wants, but things keep going wrong.
“Weren’t you interested in me?”
And a mysterious knight in black keeps pursuing her…