Both dramas have a similar feeling with dark, depressive tone, the characters are also very similar and in both dramas OST is really great. Mature dramas with very good actors and difficult storyline. I have enjoyed in both of them because I liked it that these are very different from all others typical Korean dramas with characters who are full of faults and where the chemistry between all actors is just amazing. A little note- What happened in Bali is much darker, tragic and more psychological that Que sera sera but definitely both of them are worth watching.
Que Sera Sera stars Eric and Jung Yu Mi, approximately 7 years ago, and is responsible for fans calling them the 'Elevator Couple'. It tells the story of a man who is experienced in getting what he wants from women, without loving any of them, and a woman who has never been kissed. As the drama progresses, the chemistry increases between the two, which results in some romantic and passionate scenes.