I Won Over the Male Lead's Entire Family Thanks to My Face Blindness

He Takes His Role as a Background Character Seriously, but the Male Lead Won't Follow the Script

Please Recommend Me Some Books 📖

I'm looking for a story about a shamanic medium, but I can't remember many details. I only remember that something was attached to the male lead, and he had to choose between two paths: one was especially difficult but took less time, while the other was easier but took longer. As he needed a faster solution, he chose the first path.