About Taekjoo being dumb

So I understand alot of people calling him dumb and all, but then there are people who are saying the plot is so fucking good, it has a good story too so you won't get bored and it got me thinking.

Sure Taekjoo is dumb, I also realised that thing but with the latest chapter revealing that the other spy agent (that was supposed to work with Taekjoo but was pushed aside as zhenya played his role) I realised that the second agent guy is American which means that one Korean agent and one American agent were supposed to work together, that's why Taekjoo couldn't do much or think too much about zhenya cause they both are agents from different countries so they can't leak what their country/governments motives or plans are. Also I remember the second agent saying something like "each country has a different opinion or thought on which information is crucial or important.