I've been reincarnated. Into a novel I used to enjoy in my past life, no less! My name is Renatis, and I'll be playing the part of little sister to the female lead in this dark, tragic whirlwind of a story where a beastly bad boy shatters my sister's hopes, dreams, and her life. My sister is too good and too beautiful, and I'm not about to let that happen to my perfect sister. So, I'm taking charge. I shall turn this dark, tragic story into a heartwarming tale of healing. I will save my sister. (Source: WEBTOON)

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? (Source: WEBTOON)