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Fraternal twins Si-yeon and Si-ah couldn't be more different. One never wants to leave her room while the other is a big K-pop star.
A new semester begins, but Si-yeon is already counting down the days to the end. Si-ah shoots a commercial with her not-so-collaborative partner.
To reverse the magical mishap, Si-yeon goes back to visit the tarot card reader with Si-ah -- but bad news awaits them.
On the first day of living each other's lives, Si-ah runs into a group of schoolmates and Si-yeon messes up on stage.
Si-ah's singing ability tops the list of search keywords on the internet, but she's not thrilled about it. She also gets a surprising text message.
Gyo-seok and his gang keep testing Si-ah's patience. Meanwhile, Si-yeon and Hae-seong secretly meet up at the rooftop, but someone is watching them.
About two weeks remain until the tarot master is supposed to come back, but while Si-ah looks forward to that day, Si-yeon dreads it.
Si-yeon makes up her mind to enjoy the remaining days to the fullest. Si-ah makes a big mistake while fooling around in Si-yeon's room.
After finally realizing the truth behind recent events, Si-yeon gets scared and starts looking forward to the tarot master's return.
Hae-seong holds a press conference to answer accusations of plagiarism, but dramatic breaking news grabs everyone's attention.
When Si-yeon goes back to the tarot shop, she is greeted by an unfamiliar woman who explains the necklace to her.
With sincere hearts, Si-yeon and Si-ah try to return things to the way they were -- but it doesn't go quite as they planned.
