Nothing has to be perfect in this kind of drama, the most important thing is how the show manages to captivate your attention to bring you to the next episode. Being a hero is one of those dramas you want to watch at once to know more about the relationship between the two main characters and what will happen to them.
One is a cop (Chen Yu) who works at the counter narcotics detachement, he is supposed to be the good guy. The other one is some kind of a mysterious character ( Wu Zhen Feng) who wants to rehabilitate his father's honor (he was believed to be a drug dealer as he died while drug trafficking). He looks like the bad guy who seeks to connect two organized bands that do not longer work together. He uses extreme means and doesn't seem that successful. All we know is that he wants to avenge the unjust death of his father and looks for a drug boss named Dong.
Theses 2 characters are childhood friends but their bond is not that clear. When the drama begins they haven't been in touch for 3 years and Chen Yu is convicted that Wu Zhen Feng is a drug dealer and drug addicted. And we think so too. We don't know exactly who is Zhen Feng. We might see him as an informant, a cope undercover, a fool who aks for death. We don't know. As the drama goes on, we can see how police forces are investigating but also how drug organizations work. We also have some scenes where we are explained that drugs destroy families and people, and whoever fight against drug trafficking oranizations is a hero.
I was really interested in watching Wang Yibo and Chen Xiao working together. I was not sure of Wang Yibo's acting : he did a good job in the Untamed but not in Legend of Fei. Surprisingly, I found him very good in here. He was perfectly suited to his character and could express the right emotions when they were needed. Chen Xiao is a great actor but I think that Zhen Feng's character was a bit difficult to deal with. He had to endure the will of the drug dealers and was a little passive at times. I would have liked to see him in more winning fights. I also would have liked to see more scenes between Wang Yibo and Chen Xiao. Their characters have many things to say and explain and share with us. I would have liked to know more about their past lives when they were like brothers. So, a bit frustrated here ....
I would say a word about the OST. I really liked it. The closing theme is really moving, not surprising at all it's sung by Ayanga : Bear.

This drama has good pace, good actors and good storyline. Sure, you'll watch it till last episode.