the.com/siren song

means An alluring but deceptive appeal that lures someone toward a course of action that will harm them.

from From the Sirens of Greek myth — part-bird, part-woman creatures (later imagined as mermaid-like) whose irresistible singing lured sailors to steer onto the rocks and wreck. Homer's Odyssey gives the most famous version: Odysseus has his crew plug their ears with wax while he's lashed to the mast, so he alone can hear the song and survive it. The phrase 'siren song' entered English as a figure of speech, applying the myth to any tempting pitch — ambition, money, a bad romance — that promises paradise and delivers shipwreck.