To me, there's no comparison between QoT and Lovely Runner. QoT was such a disappointment (since I'd been looking forward to it since it announced and was so excited for it). Lovely Runner was a huge surprise (since I only started watching as I waited for another show to release) and has now become my favorite drama of all time.
Three episodes in, I found myself fast forwarding through most of QoT, which made me sad because I do love the FL and ML actors so much. Even if I FF through a show, I'll usually still watch to the end episode if the main leads' story is captivating. But even their scenes were underwhelming. I only made it to ep 6 with QoT before I gave up. I did ask in the comments there if the show improves after ep 6 and everyone said that it got a little worse after ep 7, so to stop if I didn't like to that point. :-\
Meanwhile, I've rewatched Lovely Runner at least 10 times already and the worst thing I can say about it is that the sister-in-law / brother's story was irritating sometimes. But I didn't even fast forward those scenes. I watched every minute of this drama (both when I first saw it and during every re-watch). This is so rare for me, usually I'm fast forwarding 10 - 30% of a show / filler. Lovely Runner was so engrossing and captivating. The story, the chemistry, characters, direction, everything.
Comparing QoT and Lovely Runner is like comparing a peach that looks good from the outside, but when you bite into it, it's tasteless --verses-- a run-of-the-mill looking apple fresh from the tree that ends up being surprisingly delicious and refreshing.
... is my opinion.