He already knew the other's name and origin.
Because if such a tribulation-crossing celestial immortal were to fail, then that would be the end of it. But once successful, they would be kindred spirits, so spending some effort to understand them is entirely worthwhile.
"Heavenly Immortal Jiang Weidong? An immortal I've never heard of, what on earth is his background?"
"Wait, could he be that Heavenly Immortal who previously acquired the legacy of the Cyan Profound Immortal Monarch?"
"It's said that the kid went to Luoning City and even discovered three traitor Heavenly Immortals, establishing great merit."
"No way, it's actually that lucky Heavenly Immortal? That kid has only been cultivating in the Time Sect for 200,000 years, right? Such a brief period and he's already able to trigger the Golden Immortal Tribulation? Isn't this a bit too far-fetched?"
