Someone precious to you (short story)

Kim Yeo-ju, who Jungkook likes, and Kang Yeo-ju, who likes Jungkook. Kang Yeo-ju, who chose evil for love, and Kim Yeo-ju, who was consumed by that evil. And Jeon Jungkook, who knows nothing about it. The story of Kang Yeo-ju's obsession.