Before starting to watch it, I read some reviews on many sites including this one. And I thought "This drama has to be something". But after starting it I was disappointed. I'm not saying that this drama is bad or something. It's a pretty good action drama with some intense action scenes, some awesome plot twists. I liked all of it. But about the story I mean it was neither good or bad. It was okay I guess. The story being bad this drama didn't felt boring even for a moment which is a good thing. And after finishing one episode you will immediately want to watch the next. The main actors did a wonderful job. But I didn't like the acting of some supporting roles.
Now about it's color grading. It was so bad. I mean usually we get colorful or standard color grading. But after seeing vagabond's color grading it feels like it was shoot in 2010. Also all the characters use mobile phones from 2010. So seeing it makes you feel odd. Then about the music it was pretty good with the action scenes but sometimes there was no background music. It was all silence. I hate this kinds of music composing.

So this drama is not an waste of time. It's definitely worth watching. But the story could have been better I think. But the action scenes makes you forget all of that and makes it enjoyable.