When Hye-Kyung's online friend, known as Princess, suddenly passes away, she becomes the only person who can unravel the mystery surrounding her death. As someone who has been in conversation with Princess for three years, Hye-Kyung takes on the task of tracing the events leading up to her friend's demise by delving into their conversation logs on her phone. The question that drives her investigation is a haunting one: who killed the Princess?
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