Master Chen.
In the Qi Tian Continent, calling someone "Master" is a form of highly respectful address, one that is even higher than "Senior." To call someone "Senior" implies that the person is older than oneself, or that their Cultivation far surpasses one's own.
But to call someone "Master" signifies that one regards oneself as a student before them, with much to learn and a great deal of admiration for the other party.
If it were known by others that a top-tier Family Head from the Qi Tian Continent was addressing a junior in the Body Integration Realm as "Master," they would surely be shocked to the point of disbelief. Indeed, the Bai Family Patriarch did not find it easy to utter "Master Chen," as it had been many years since he last used such an address. It felt remote, as since his ascendance to Family Head of the Bai Family, scarcely anyone on the Qi Tian Continent was worthy of being called "Master" by him.
"Hmm?"