Both lead actors are likeable they haven't done any negative roles. Which actor you don't like?
You won't believe me but when I first started watching kdramas, I also had such sentiment about Gong Yoo, Yes Gong yoo. So I always tried to dodge watching Goblin but after some time i had to watch it because it seemed quite a pity to not watch a high rated show because of that reason. So I did and goblin's character completely washed off all my prejudices against him. Later I even binge watched his dramas just because it was his work LOL. So basically what I am saying is some character do define actors. why not give her a try. I have watched her other works and she is really good actress.
This drama reminds me of the quote - "Circles, we are going in the circles. Dizzy is all it makes us. We know where it takes us, we have been there before, Circles."😆
http://biphimz.tv/xem-phim-tinh-co-ta-gap-lai-nhau/149070-8118.html