What device is needed to implement the following network diagram?

Question

Network administration

Good day friends.
My question is what is the simplest and cheapest solution to implement the following network.
There is an apartment with a corridor and two rooms. In the corridor there is an Internet access to the apartment and network cables are brought out from both rooms. In room number 1 there is a router that connects to the Internet and distributes Wi-fi. In room number 2 there is, let's say a TV that needs to receive the Internet from a cable (not via wi-fi). Thus, I need to connect the wires in the corridor so that the router can simultaneously connect to the Internet cable and to the cable in room number 2. In case I did not clearly describe the network diagram, I sketched an even more intricate drawing https://docs.google.com/drawings/d/19NzDEiPjXQ44ZG...
The task is complicated by the fact that I would not want the connection in the corridor to need to be connected to the electrical network, because. putting a second router there is an extreme measure that I would like to get away from.
Any ideas?

Answer 1

You take the wire that goes to the router, cut out 4 lived and twist it with the TV wire.
At the router, you pull out these same 4 lived, squeeze it and shove it into the lan.

Answer 2

If there is no gigabit, then you can put two splitters on the wire from the corridor to room 1: on the orange and green Internet cable, on the brown and blue LAN from the router - connect the Internet and the Internet cable, LAN to room 2. If you don’t install splitters, you can even do it on twists - it will work depending on the quality of the wiring connection.

Answer 3

In the corridor, hang a PoE-powered router, such as MikroTik. Set one of the interfaces (2-5) as WAN, plug the Internet into it, set the rest as LAN.

Answer 4

Is it possible to move the router to the corridor? Communal apartment? It would be nice to put a router in the corridor, connect both cable 1 and cable 2 to it (such a standard scheme), then there will be Wi-Fi and a LAN network.