Should I practice climbing Hallasan in advance?

To go to Hallasan,

Is it necessary to practice mountain climbing for a month in advance?

I've never been there, so I'm really curious.

If you have experience, could you please share some tips?

I heard that I need to go up early in order to finish the hike within the time.

I'm wondering how much stamina I need to build.

Please tell me if you must wear sturdy hiking boots.

There are Gore-Tex hiking boots, but they are a bit heavy like military boots.

I'm not sure if I should wear this or if I can wear running shoes.