The spiritual energy is revived and the dragon veins are awakened. In order to protect a young girl who has awakened her spiritual roots, retired soldier Zhang Wei hides in a high-end community and works as a security guard. Various forces sneaked in under the pretext of buying a house and competed for the underground dragon veins, calming the community's undercurrent. Zhang Wei uses surveillance to detect strange phenomena, uses patrols to uncover conspiracies, and silently protects his daughter and home. Until the night of the full moon, he found that his security booth had quietly transformed into the "Nantianmen" sentry connecting the ancient heaven - from then on, in addition to checking water and electricity, preventing theft, and managing parking lots, he also had to work part-time to balance the three realms. When all the gods and demons had to register in front of his small post, everyone was shocked to realize that this seemingly ordinary security guard was the most unfathomable sea-fixing needle in Longyuan Mansion.
