The Korean livewire was among United's outstanding players in a hard-fought victory on Merseyside; a vital result in the champions' quest to retain the Premier League title.
"It's good to get back to winning ways," Park told MUTV. "Today everyone just fought to win the game. The determination was great and it's good to be back to winning ways.
"We tried to forget [the derby] as quickly as we possibly could, get through the Carling Cup [against Aldershot] and then today. That's two games we won, and that's the more important thing. We forget about last weekend and we just look forward to the future.
"It's great to win 1-0 because our defence were tight and solid today, so that's more important. To win the league, we have to continue to play like today."
Park also took time out to praise the contribution of Nemanja Vidic, who shone as a beacon of defensive defiance in his first Premier League start since the opening day of the campaign.
"He's been great and he's an experienced player," said Ji. "We need him back and he played very well. Now we have more confidence to play because Vida is back."