‎She was the first mistake Jihyun Yunha never corrected. ‎What began as a childish rivalry over a shared name slowly turned into something far more dangerous-habit, dependence, jealousy, and a feeling neither of them could define. ‎Kim Yana was never supposed to matter. ‎But somewhere between silent care, unread diaries, and the color dark red, Yunha realized something terrifying- ‎some people do not simply enter your life. ‎They stay. ‎They stain. ‎And slowly, they become the one thing you can never let go of. ‎Is this called love... or obsession?