The First Undercover Agent in the Immortal Realm

Content Introduction: I, Lin Yun, have excellent aptitude, possessing the qualities of an Immortal Emperor. I originally thought I would become the beloved disciple of the sect, cherished and doted upon. Never did I expect that they would send me to infiltrate the enemy's lair as an undercover agent. So, the question arises: What to do when you capture the Demon Lord at the very beginning? Elder: "What I meant by going deep into the tiger's den was not this..."