I know it's decently rated but I personally wouldn't recommend Liar Game. I heard the Japanese version is a lot better. The SK drama is just so bland to me and provides no excitement like the psychological thriller it should be.
Dr. Romantic - Might be an unpopular opinion but I couldn't get into the story, the kiss in episode 1 was weird and I couldn't bring myself to like the characters from what I've seen. Dropped it after 2 episodes.
My Engineer - the concept has been done so many times but better. pretty much your average college bl drama. the main couple got annoying extremely quickly and the side couples could've been shown more.