A-wa B-ui Chosang

In a village encircled by strange rumors of a certain estate, Yoon "A," an average high school boy, is suddenly dumped with a single handwritten letter. As A retraces the clues his (ex)girlfriend left behind in order to discover the reasons behind her decision, he becomes closer to Shin "B," the slightly gloomy and strange student librarian...

(Source: Lezhin, translated)