The Serpent's Shaman

After suffering frightening spiritual symptoms, Park Sinwu undergoes a shamanic ritual and meets Biyeon, the spirit he's destined to serve. Biyeon is beautiful, demanding, oddly affectionate... and insists that their "union" is the only way to protect Sinwu. But as Biyeon grows clingier and Sinwu's doubts deepen, he can't tell if this god is his guardian or something far more dangerous.

(Source: Lezhin Entertainment)