Well there is no one answer to this question, in case of a nuclear winter there will be no internet, no electricity, no law and order so in that case any currency will become useless, The chances of bitcoin becoming a safe haven in case of world war 3 are very slim. I don't see people residing to something virtual which will provide them zero value in the brave new world.

I think if world war happened I think we will think about our safety first, how are we going to survive in the middle of this kind of societal circumstance, I think It will deprived us from working here and stay in evacuation area most of the investor will stop inveating here and keeping their funds safe so after war they can use it, in a nutshell it will gone, cause the fact that workers are gone bitcoin will extinct.

Silly question.
WW3 is not going to happen. Korea aint going to do squat.
Stop watching the news, they just trying to trick and scare you.
If you are going to choose to worry about something (why?!) worry about your hearts health or what you are eating.
Also no matter what happens to you or Korea BTC is going up so stop worrying!

A World War will most likely affect all currencies unless the war is localized to neutral battlefields. The chances of bitcoin becoming a safe haven in case of world war 3 are very slim. first thing first, let's hope it will never happen.

there is already world war against btc currently

Just for the hell of it, I’m going to pretend the only thing you have to worry about is your money when the fallout starts raining down.

If your country is one of the combatants you will most likely lose all access to the internet because your country will need to control the flow in information. Former shipping lanes (railroads, highways, waterways) will become military targets and under military control. Because of the control of shipping lanes it’s likely that normal commerce will cease to exist. The means of production will be aimed at military uses and civilians will be given products necessary for population survival by marshall law deliveries.

Under the above WW III scenario, the currently used fiat will be suspended. Military scrip will likely replace any form of currency used to buy anything. Most staple products can only be purchased from government distribution centers. Millions will die from radiation exposure or starvation. Currency between individuals will be anything of value. Things like medicine, gasoline and food will be the new money. Bitcoin will be nonexistent.