Choi Eunji is a girl who consistently experiences lucid dreams as she sleeps, this gives her the ability to have consciousness in her dreams and have vivid memories about it after waking up. Though it is not impossible, she has somehow only met and seen only one person, a girl which name was Ye-jin. Overtime, Eunji starts developing feelings for the mysterious girl, but she decides to hide her feelings for Ye-jin was not 'real' and that falling in love with the same gender is a sin. Will Eunji be able to suppress her feelings 'till the end?