the acting is really good but the ending could have been better if they follow the story.

I've read the webtoo and I'm honestly quite disappointed that they didn't follow the ending...the whole reason Harin picked on Ja-Eun was not because 'she used to be a bystander and didn't play with her' but because they were sisters. their parents where poor and couldn't take care of 2 children. the wanted to put one of them out for adoption. the sisters made pact but Ja-Eun betraid Se-eun/Harin at the very last moment. Harin had to leave, she endured a lot of torture in the orphanage. one day she saw her sister with their mom being all happy and she decided to get revenge.

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