Gabriel was originally assigned as Yoo Joonghyuk's Guardian Angel. Unexpectedly, the Demon King of Salvation also laid his eyes on her human, claiming himself as Joonghyuk's Guardian Demon, and started to tag along with her, nurturing Joonghyuk. 28 years later, shits happened, Yoo Joonghyuk became suicidal, and Gabriel was about to bring him back to Eden after his demise. But the Demon King stepped in, saying he wouldn't let that happen. Actual summary: Kim Dokja annoyed Yoo Joonghyuk so much dude gave up on killing himself.