From the Start: I'm an Undercover Agent in the Sacred Sect

After transmigrating to a cultivation world, Gu Qing became the eldest disciple of an immortal sect. The sect master sent him to train at a rival sacred sect, where he was also supposed to gather some intelligence. “What! Five immortals?” “What! You treat immortal herbs like radishes?” “What! I have the lowest cultivation level in the sect?” Years later, Gu Qing returned to his sect. Thousands of disciples bowed and called out in unison, “Eldest Senior Brother!” “Eldest Senior Brother? What are you talking about? I am the sacred sect’s master.”