Can someone give me a summary 😭 I'm scared to read

If you write a letter to your dead lover, your lover will return early that morning. Jinhyeok, unable to accept the death of his lover Do-seong, who died in an unexpected accident two months ago, falls asleep while writing a letter... The dead Do-seong appears in front of him!
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That’s the summary. Spoiler tho——————————





Do-seong is back to being dead again bc apparently he can’t stay for too long unless mc turns into a monster?? I think idk but it’s pretty sad