After Kang Ki-beom has gone to the eye specialist to fix his problems he continues his search for the van that kidnapped him. He closes his eyes and we get transitioned to a view that is supposed to illustrate inside Kang Ki-beom mind. Here the implant shows him information that it has gathered and what Kang Ki-beom should do next.
He can watch surveillance feed with facial recognition identifying people. The AI is decrypting and he seams to have access to more data. The AI is starting to talk with him implying that he can give it orders to e.g. search the surveillance data in front of him. The AI says "Please be clear with your order". (Linda) (Episode 4, 57:00)
Later (Episode 4 1:10:02) back at Kang Ki-beom is starting to control the AI giving it orders like "Find everything about" Hwang Deuk-gu the AI overwhelms Kang Ki-beom with data in form of video feeds and images he reacts physically to it breathing hard and holding his heart. But together with the AI he seems to process the knowledge that reveals doings Hwang Deuk-gu. The scene ends in Kang Ki-beom thinking "I'm coming for you in my own way"
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