Delivery boy Lin Ye (socially fearful, "invisible man" who is afraid of trouble every day) was delivering orders when he encountered an evil cultivator making a Yin puppet in an urban village. When he was about to die, he awakened the memory of the immortal soul of the "Ten Thousand Magic Loose Immortal" - this Loose Immortal escaped into the human world because he rebelled against the rules of the fairyland of "exclusively honoring the immortal." His memory contains the "Wild Immortal Technique" adapted to the city (changing the take-out box into a magic weapon, turning a mobile phone into a spiritual energy detector, etc.). He relied on these magical skills to save his roommate who was attacked by a puppet, and met Su Wan, a trainee forensic doctor who could sense aura due to the evil cultivator's murder case. The trio hid their identities and "worked" in the city while taking down the evil cultivator gang and exposing the immortal cultivating organization disguised as a technology company. Finally, they fought against the "immortal robbers" sent by the fairyland and used the "mortal-friendly magical skills" of loose immortals to keep the balance between fireworks and immortality in the city.
