The phrase "When Destiny Brings the Demon" refers to a Chinese fantasy drama series (also a novel) about the story of Sima Jiao, a powerful immortal master who was sealed in a mountain for 500 years due to his overwhelming demonic energy, and Liao Tingyan, a modern-day woman who reincarnates into a disciple in the immortal world. Their fates intertwine as they develop a complicated love-hate relationship that spans three lifetimes across the fairy palace, the demonic realm, and the human world. The story explores themes of cultivation, power, love, and fate, with Sima Jiao embodying the demon whose destiny brings significant upheaval and transformation. The demon referenced by destiny is Sima Jiao, who carries the purest essence of demonic energy and was sealed away for centuries by higher powers fearful of his power. The series follows his release and the unfolding relationship with Liao Tingyan, who changes his outlook and role across realms. In summary, "When Destiny Brings the Demon" is about the destined encounter and interaction between a sealed demon-like immortal and a recurring love interest who influences his path. This explanation is based on the synopsis and recaps of the drama series released in 2025 and adapted from the novel by Fu Hua.