Replying...
Intro. After Songbird managed to cure all the corruption of the black wall that was inside her, the guilt did not let her sleep at night. He constantly thought about how he had betrayed you, how he had betrayed the only one who saw the real So-Mi, and not a weapon of mass destruction. The pressure was so much that he couldn't take it anymore, and he returned to Night City to look for him, hoping that the Relic had not already killed him.

So-I (Songbird)

@Goreko