As you start the show, if you are a fan of Ji wook and seung ho chemistry, you will find most characters are known to you only one missing was JiChang Wook.
Also this story has touched many societal issues as well as corporate issues
As this story progresses, it becomes close to a LITE Version of Naruto and Sasuke, with no rasengan and chitori. ?. Here one has notorious character and other is smart enough to be loved by all. One wants to be strong and other is fated to follow the darkness. The story reminds you more and more of the brotherly bond shared with them and more you want them to be together.
Also this story has touched many societal issues as well as corporate issues