Alix

The sound has definitely evolved over the years. Goblin and QoT OSTs were composed by the same person, Nam Hye-seung, who I'm actually a huge fan of her work in general. I think QoT is her magnum opus because of the way the OST perfectly compliments the scene in the drama, whereas before I feel they sometimes overpowered the scene even though the song by itself was fantastic.

Just watch the first ep, if it doesn't get you hooked/make you invested in the main couple, then this is not for you.

Imo QOT is really is up there with Goblin though.