Moral of the story: Kang Tae Ho will be the only one fully fulfilled emotionally and professionally, he will live a full and happy life.
The other characters will be eternally depressed and lonely, as if a piece was forever missing throughout their lives.
Kang Soo Ho did NOT deserve the ending given to him! Whoever thought the ending was wonderful... is mistaken, depressed and lonely lives.

Besides, it's about the stupidity of politics, in the drama it was fictional but we know that politics has its stupid side, it's about revenge, and forgiveness and the forgiveness part... the husband should be forgiven, the only one who actually had a slip-up seriously but he really DESERVES to be forgiven.

https://www.youtube.com/watch?v=QMYSiBnC52I (I put the link so you can think about it: who is the warlord today, which policy is being stupid)