Heavenly Lord of Two Realms

There is a secret passage that opens in a thousand years between the earth (a modern city in 2024, where aura is recovering, and the descendants of ancient martial arts families and immortal cultivators are hidden) and the Xuanhuang Realm (a vast world of immortal cultivators, with numerous sects in the five realms). The protagonist Lin Chen is a "two-realm body" that is rare in a thousand years and can travel freely.