Chromecast with Google TV (New Chromecast) How to solve when remote control doesn't work?

I'm using a new Chromecast model, but the remote control stopped working at some point. Looking closely, the white LED was blinking slowly on the remote control. 

I tried various methods such as pressing the home button, removing and inserting the remote control battery, pressing the home button and the back button together, and restarting Chromecast, but there was no improvement at all.

There were two solutions found on the Internet.

1. Initialize the chromicast. -> This was left as the worst option. If I reset it, I have to do various settings again, so it's annoying.

2. Re-pair the remote control in Chromecast.

No. 2 was a simpler solution, but the problem was that Chromecast control was not possible without a remote control. Looking through the Internet, there were two solutions here as well.

1. Plug in a USB-C type hub (power inputable) and use a wired keyboard (or mouse).

2. Use a Bluetooth keyboard.

In my case, there is a Bluetooth keyboard that I don't use at home, so I decided to use number 2. (Actually, there was also a hub) If there was an existing paired keyboard, it would be easier to solve it, but most users would not pair the keyboard and use it.

In this case, pressing the button of the chromicast twice automatically enters the Bluetooth pairing mode in the chromicast. After that, when the keyboard is also in pairing mode, Chromecast automatically attempts pairing.

I think it's set up to automatically pair in case of this case (when the remote control is lost, broken, or unpaired, etc.).

Like a normal pairing process, type a number on the keyboard and press the enter. After going through this process, enter the Settings -> Remote Control & Accessory menu in Chromecast, release the existing paired remote control, and pair it again.

When pairing is completed, the Chromecast remote will now operate normally. 

+It's an additional method. Using the Android TV remote control app, you can replace the remote control when it is not easily paired. 

I hope the above will be helpful for those who are experiencing the same case as me.