C50 Closed-door comprehension

Not far from the Profound Capital's main hall, there was a barrier. Nangong Shi curiously looked at Spiritual Master Cang Shen, only to see her smiling, her hands forming a seal, then the barrier began to slowly open up like an automatic door, which Spiritual Master Cang Shen pulled Nangong Shi and walked in, but not long after, the barrier automatically closed up again