I would rearrange and rephrase what you wrote to something like this. Currently I am watching a TV show that revolves around a detective solving cases. It isn't very violent, but each episode is starting to get repetitive. Something bad happens, the detective works with someone involved on the case, and then they solve the case together. Hope this helps!🍻

Thank you so much. Max Sosa. How can I improve to write? Do I have to read English book a lot?

So if you are watching something with episodes, you should call it a television show, or television series. It's not often that movies have episodes, except for special cases (like the Star Wars franchise). So, your first sentence might be rewritten as: "I'm currently watching a television show." The second sentence "It's not too violent and brutal" is mostly alright, I would only change the "and" to "or". "It's not too violent or brutal." In your third sentence, it may sound more natural if you split it into two sentences. "The plot in every episode seems to be similar. Something bad happens and a detective solves the case with the help of a mystery guy, but sometimes it can be boring." If I were to rephrase this in my own words it would be similar to: "I'm currently watching a television show where a detective has to solve a case after something bad happens. The detective also has the help of a mystery guy. It's not too violent or brutal, but sometimes it can be boring." Hopefully this was helpful! Good luck :)