Impacting the Spiritual Aperture to reach the Divine Palace requires a moment of enlightenment, and Su Xin was undoubtedly entering that state.
The Divine Palace in the brow is where one's body and heaven and earth are closest, understanding the flow of Primordial Qi of Heaven and Earth, Refining the Divine Palace in the Brow, this is the Divine Palace Realm.
This step is as simple as it is complicated.
Some people break through to the Divine Palace Realm shortly after breaking through the Spiritual Aperture Realm, but some search long and hard without finding a semblance of an opportunity.
Su Xin was quite fortunate, while leisurely wandering around, he heard the heartbreaking drama performed by a grandpa-grandchild duo, triggering his emotions, seeing his heart's nature, his thoughts became clear, leading him into that state.
Unfortunately, Su Xin's lucky streak didn't last long before it was interrupted by someone.