Searching for "my childhood friend xter" suggests you're likely looking for information on the popular manhwa/webtoon titled (also known as Soggubchingu Keompeullegseu
My Childhood Friend (Genre Standard) Genre: Romance / Slice of Life / Drama Status: Completed/Ongoing my childhood friend xter comic full
Originally a web comic by Azusa Banjo, this series (Japanese title: Koisuru (Otome) no Tsukurikata Searching for "my childhood friend xter" suggests you're