Planes of Existence

The 2018 C-drama Ashes of Love 香蜜沉沉烬如霜 reached 100 million views in just 15 minutes after the broadcast of its first episode and since January 2019, the series has garnered over 15 billion viewers. Thus, I watched the TV series, learning very quickly that in the show, beings exist in 6 realms.Then, I remember that in Buddhist comology, beings are said to exist in different realms too; six, I thought; but a friend said there are 31. Both of us probably were right to a certain extent. According to a source, there are indeed six major realms; purgatory, asuras or jealous beings, ghosts, animals  humans and higher beings.There are 25 more belonging to heavenly beings; the higher beings I suppose; but that I've yet to understand...