Lin Fei lets Gu Mang venture out on his own, not wanting Gu Mang to always grow under his wings.
Moreover, Lin Fei knows that he hasn't really interfered much with Gu Mang; almost everything is done by Gu Mang himself in cultivation and pursuing his own matters. This kind of release merely lets Gu Mang return to the life he wishes for.
Lin Fei doesn't know whether Gu Mang will continue to cultivate diligently after leaving him, but he knows this step is necessary for Gu Mang to take on his own path. After all, Lin Fei can't manage Gu Mang forever; he has his own road to travel.
Ancient Martial Artists in the long river of time resemble their powers: strong and resistant to the ravages of time, making their lifespans very long.
If Gu Mang continues to cultivate at this pace, his lifespan will be at least four or five hundred years. Such an advanced age cannot always shadow Lin Fei.
