Here White is in a zugzwang
Zugzwang is when you wish it wasn’t your turn...
White has only one legal move (Which is putting his King here)
But this move is bad (since it cause him to lose the game)
If White does move here...
Black can just move his King here...
And nothing can stop this pawn from becoming a Queen
You cannot skip your turn in chess
But if it was blacks move instead...
Black would move here (otherwise he loses his pawn)
But now, White has no legal moves
Since if White moves to one of these squares his King will be captured
So this game ends as a draw (stalemate)
But since White has to move here...
His move ends up losing him the game