aka: Gay Ancient Magic China (one of them, at least)

Original media: 陈情令 / Chén Qíng Lìng / The Untamed
which is the live-action adaptation of the novel: 魔道祖师 / Mó Dào Zǔ Shī / The Grandmaster of Demonic Cultivation

Cultivators are magic warriors who use their magic and swords to hunt down monsters and undead.

(Multiple people write this setting, and each write it a little differently)