Both Lakorns are about twins and the consequences that happen when a man is left by the twin he loves which leads to a case of mistaken identity when he meets the other twin.
Love is the best is based in the this thai lakorn - but the story has been tweaked a little
Both are about historical made up kingdoms, botched arranged marriages, power struggles. Kwan is also the female lead in both.
Very similar themes - an abusive and dysfunctional relationship and problems with family relationships