The ending of 'The Gunslinger' is quite profound. Roland arrives at the Dark Tower. Throughout his journey, he has lost friends and faced numerous challenges. Once at the Tower, there's a sense of both accomplishment and hollowness. He has achieved his long - sought goal, but at great cost. The ending leaves the reader with many questions about Roland's future and the nature of his quest. It's an ending that ties together the themes of sacrifice, perseverance, and the search for meaning that have been present throughout the novel.
In the ending, the main character Roland has become more hardened. His experiences on the journey to the Dark Tower have stripped away some of his initial naivete.
The information provided by the gunslinger TV series did not mention that the series had 40 episodes, nor did it mention that it could be watched for free. Therefore, I don't know if the gunslinger TV series has 40 episodes and if it's free to watch.