Episode 5: The Last Letter

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After her twin sister's death, Yoon-seo transfers to a new high school and is assigned the exact desk her sister once used. The boy sitting beside her, Do-hyun, reacts as though a ghost has taken that seat. What begins as a cruel coincidence unravels into a trail of unsent letters, borrowed habits, and one sealed message hinting that Yoon-ah understood far more than anyone wanted her to.

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