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The souls of two girls with different personalities accidentally exchanged. They tried hard to play each other and not cause trouble to each other, but overall they were more like themselves. They made new friends under their new identities and gained new insights. Later, they participated in an event and were assigned to a group with two boys. As they got along, they were gradually attracted to each other. It was the accidental trigger of the two boys that caused them to switch. What's the secret behind the unexpected exchange? Why is it related to the four of them? Together they will find the answer.