Both are Thai GL. Both are set in high school or partially set in high school. Both are romcom and has less drama than most GL.

Both are GL. They are both GL in the RomCom genre. AyaHiro is based on a japanese manga and Somewhere Somehow is a Thai series based on a GL novel but it's vibe is inspired by japanese Yuri manga.

Both are Censored version of a lesbian novel/manhwa.
Both are set in the same time period.
The women are expressing their love thru giving gifts and acts of service.

Both have great cinematography and discusses the role of women in the society. You Yi being a writer, Yan Wei who owns a photo gallery shop, Jeong Nyeon, Yeong Seo, Juran and all the students of Maeran Gukgeuk being theater actresses.

Both are Thai GL series(Lesbian Romance). Both have a (sort of) love triangel in them between women. Both have romance and drama.

Both are Thai GL series(Lesbian Romance). Neko who is in Roller Coaster is Yoko's irl sister. Both have romance and drama.

Both are Thai GL series(Lesbian Romance). Both have love triangels in them. Both have romance and drama.

Both are Thai GL series(Lesbian Romance). Both have love triangels between women in them. Both have romance and drama.

Both are Japanese GL(Lesbian Romance Series). Both series have romance but also deal with various social issues.

Both are Japanese GL(Lesbian Romance from Japan). Both are a romance series but both also deal with some serious subjects too, however Ayaka-Hiroko is more of light hearted comedy and Call-me-by-no is darker and more serious in tone. They share one producer that worked on both series.

Both are Japanese GL(Lesbian Romance series from Japan). Both focus on a sweet romance but also on some serious subjects.

Both are GL(Lesbian Romance). Both have romance but also deal with serious subjects, have Complex characters and has mystery.

Both are GL(Lesbian Romance). Both have romance but also deal with darker subject matter, especially the love interest in both Series that has trauma from her past. TRIGGER WARNING, SPOILER (both characters have experienced abuse or SA)