dang so many ppl want spoilers lol
SPOILERS
So basically our mc is actually the twin sister of the real Sera. They were separated at birth (I can't remember why sorry), and raised to live totally different lives. The real Sera was a totally nice girl who was a little shy. The crazy girl with blue hair when she was born was apparently born to be unlucky and a shaman told her parents that she would have an awful unfortunate life and live unloved unless they chose to switch her fate with someone else. Idk if the girl truly would’ve grown up to have an awful life, but she lived her life miserable because of the words of the shaman hangin over her life, but when she met Sera she became obsessed with her and wanted her life so the shaman switched their fortunes for money. This made Sera start to lose control of her life, doing crazy things and acting as a bitch with no control. Basically her body and mouth moved without her input and she was screaming inside but couldn’t stop herself. Our mc lived a totally normal life until she (and this part is my speculation cuz none of the spoilers I saw ever addressed this) somehow began dreaming(?) about Sera believing it to be a tv show (possibly this is all caused by the fortune switching where she sees crazy blue haired girl as the main character and Sera as crazy in this “tv show.” Maybe it’s like twin magic?) and they then switched places after her heart attack, with the real Sera going into mc’s body which is currently in a coma I believe and mc taking over Sera’s body. None of the misfortune will stop though until the fortune of her and the crazy girl is switched again.
Also Sera and mc are not the chairman’s biological children, the mom cheated on the dad to have them, but dad doesn’t care and views Sera as his daughter because he is secretly gay and was in love with Aaron’s dad which is why he took Aaron in as a ward.
Mc and Sera will eventually switch back and Sera will et to finally live out her life in control of her own body and Mc will get together with Aaron
She is actually the real Sera im 100% sure. I guess that this crazy B did something so someone elses Soul entred Seras body but Sera came back