When shy and timid Eunseo was forced to transfer to the elite Stella Academy of the Arts, she expected lonely school days filled with cutthroat competition. So she's taken by surprise when the free-spirited Ina takes a sudden liking to her. The two girls become closer as they secretly meet on the rooftop after classes, and Eunseo's friendly admiration grows into something more. Luckily, Ina returns her feelings as well… but they seem to border on a dark obsession that grows larger by the day. What will happen when Eunseo discovers the hidden reason behind Ina's mysterious love?