First I must infom you that I'm watching the 21th episode rn.
At the beginning of this drama especially in his childhood I was thinking he'll become a rightious, sorrowful but intelligend and still gentle hero...
Oh boy was I wrong! I can't believe how mad he makes me! How stupid and prejudiced he is. Well I guess so many years with his manupulative and singminded 
mother made him that way but still I feel like the scriptwriter(s) really didn't care or intend about making him a likable character or just failed (at least for me).
I was actually ignoring his behaviour pretty well until this moment (screencap below). He said just so much enraging things to PM Eun Sang without really 
knowing him or at least considering him as a normanl not evil person -_-
By now he should now what kind of person PM is and how pitiful he actually is. He spend 15 years by his side too.
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Anyone who thinks the same?

He gets better, I promise. Just keep watching
He does? I stopped watching  it because the whole plot was going downward for me, and I'm waiting for the end, but does it really, @serap?
I'm on ep. 36 and... I don't want to spoil anything... but hyung woo is a lot smarter, so it's less painful to watch.