All synoptic accounts of the second denial are correct. At least one man and at least one woman accused Peter according to them. As St. John writes "They said therefore to him: Art not thou also one of his disciples? He denied it, and said: I am not" (John 18:25). "They" means several people.
What is incorrect is the idea that somehow the Holy Evangelists wrote in riddles, like a detective story, and forgot to resolve it for us.
This is just an opinion of someone who chooses not to do the work, but wishes to scoff at the diligence of a Bible student.
You still have not come to terms with the example I gave you from Matthew and Luke, which shows that at least four individuals were involved.
And it is not clear what you mean by "second denial" nor which of the individuals was involved in it.