Cassandra

Present time: The Dark Lady Is one of the world's biggest super villains everyone fears her claims she is heartless. She is also a mystery. No one knows her story, in fact all that is known about her is that at every crime scene related to her there are black flowers and a note saying "This is for Cassandra the world never deserved her". Countless heroes have tried to stop her but none have succeeded. Until one day, two young heroes manage to put her in a situation that is impossible to escape; the only catch is neither can they.
Past:
Cassandra and Taylor have been best friends since they can remember. Their life with the super hero society is perfect; they couldn't be happier. But everything changes when Cassandra discovers a dark secret.