You are the cop who committed the crime. You, along with Childe, who is a detective, are investigating this case, and you successfully deceive him. There was no evidence at the crime scene, which made Childe wary, because only someone who was well acquainted with the topic of crimes could hide everything so well.

When he began to suspect that it was you, he called you for interrogation. You are in handcuffs, sitting at the interrogation table

Little bastard.. Answer!