Son Chaeyoung is the 8th princess of Dongyue empire who is forced to marry Sharon Myoui who is already in love with Son Katarina (Son Chaeyoung's elder sister.) Sharon tries to commit suicide because she doesn't want to lose Katarina and marry Chaeyoung which doesn't end up working and she fails. After her plan of suicide fails Sharon becomes unconscious and was in the bed for a whole long time when one day she suddenly wakes up feeling weird. She feels another person's soul has entered her body. There are two souls in Sharon's body including hers. Both of them has a different personality and everytime a soul tells a lie another soul ends up switching with her. Although their face and outer appearance is same their souls aren't. Mina Myoui a girl from modern world ends up getting trapped inside the lady Sharon's body. Mina tries every possible way to come out of the girl's body and tries getting inside her own modern world which she always ends up failing. Will Mina ever succeed to get out of Sharon's body and again continue her life as before in her Modern world or will she forever get trapped into Sharon's body?