The forward was brought on ten minutes into the second half in a game void of clear opportunities and opened the scoring with a shot from distance which was helped into the net by Russia goalkeeper Igor Akinfeev.
Lee admits he did not think he would score when he hit the shot, but was delighted to see it cross the line.
"I've been waiting for this World Cup for so long, but I'd never thought I would even score," he said. "I think I was lucky, but it wasn't a bad start from me.
"To be frank, I never thought it would go in because I shot it straight at the keeper. But during the warm-up my efforts on goal weren't bad so I just went for it, and I was lucky."
"Tonight's result was a bit disappointing but I think we played as well as we had expected to," he said.
"Hopefully we'll be in a higher gear when we play Algeria and will be able to get ourselves a better result because of it."