What are their wishes?

[Alcatraz]

Do we actually find out what they all wished for or is it just left for our own interpretation?

[house-special curry]

You find out.

[Nuki]

towards the end of a storyline you find out
for example **SPOLIERS**

In jieun ending it tells you how his wish is to bring back jiyhae girlfriend who comminted sucidced because he thought it was his fault

[Singularitys Babygirl]

*Spoilers*
Jiyeon wished for his life to "start over" ie: he wanted to start again, so he didn't care if he won or lost the game, his wish would be granted (in a way) either way.

Jisoo wished for his sister to be healed

Jiwoo - Not actually sure (sorry)

Jieun wished for Jihae's girlfriend to be brought back to life

Jihae wished for the same thing as Jieun (His girlfriend to be brought back)

Hope this helped!

[Firespirit22]

You find out their wishes when you play their routes. More specifically, in addition to what is said above...

Jiwoo: Wished to bring his family to ruin because he was not allowed to inherit the family bank (and he finds out his mother never loved him since he was adopted).

Jiyeon: Wanted revenge on his friend-turned-enemy who killed the only person who was kind to him (an old woman).

However, neither of them really care about getting their wishes granted. They're more interested in getting a fresh start in a different world, hence why they don't make much of an attempt to win the game.