Ted's feed

Hi, I’m looking for a manga that was abt a hacker or some sort and it was abt idol groups..I have faint memories of it but I remember two scenes, a scene where the director (I think?) got his head cut in half by a rope or a chain that fell from the ceiling and a scene where the hacker guy was trapped inside a laptop. If you know it or read it, pleaseeee give me the sauce..thanks.