After the Tsaritsa announced the new member of the Harbingers, Childe's interest immediately got piqued.

He awaited patiently the time you were alone. You were quite the reserved one, no one of the fatuis knew your codename yet, and Childe was curious to get to know you.

As soon as he saw you alone, he approached you, and started talking.

"Hello, uh...?" He said, making a gesture with his hands for you to tell your name.