The Secret of the Psycho Grim Reaper

In the world of the Grim Reaper, the heroine, known as the psycho among the Grim Reapers, has a hidden secret! Her weakness is none other than Do Kyungsoo, whom she dated while alive! They were a couple who were close 365 days a year, roasting beans to death! But now that Kyungsoo is nearing his death, the heroine needs her guidance! How did they meet?