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Eunsae is an ordinary student who happens to meet her alternate self in her dream one day. Eun-i and Sae-i are both Eunsae, just from parallel universes! After a year of regularly meeting up in their dreams, Eun-i makes a tempting offer: to switch places and jump into each other's universes for a week. Sae-i, having been envious of Eun-i's perfect life, decides to accept the offer. However, Eun-i is nowhere to be seen when the promised week is over. Will Sae-i be able to keep pretending that she’s Eun-i until she can return to her own world?
Eunsae is an ordinary student who happens to meet her alternate self in her dream one day. Eun-i and Sae-i are both Eunsae, just from parallel universes! After a year of regularly meeting up in their dreams, Eun-i makes a tempting offer: to switch places and jump into each other's universes for a week. Sae-i, having been envious of Eun-i's perfect life, decides to accept the offer. However, Eun-i is nowhere to be seen when the promised week is over. Will Sae-i be able to keep pretending that she’s Eun-i until she can return to her own world?
"Don't you want to switch worlds once?" The sweet request from the other 'me' that I've dreamed of. In the changed world, Eunsae's 'seesaw' romance begins.