This is the 69th most frequent Hebrew word.
כן
"Yes" or "so" (depending on context).
Here, 'כן' is used to emphasize the positive intention or affirmation in the sentence.
אני כן רוצה לעזור לך.
I do want to help you.
In this context, 'כן' highlights the positive aspect that contrasts with the initial negation in the sentence.
הוא לא ספורטאי מקצועי, אבל הוא כן מתאמן כל יום.
He is not a professional athlete, but he does train every day.
Here, 'כן' is used as an affirmative response or agreement.