What I got from it was that the MC initially hated her step sister (she believed she was lied to by her sister); however, two years after she woke up, she found out the truth that it was all a misunderstanding and her sister did what she did thinking of the MC (kinda like she became the scapegoat of the situation, everything was blamed to her). So after finding out, the MC instantly regretted her actions and for being happy for her sister dying. Now she wants to meet her sister and apologize to her and maybe properly become a better sister.