Dali and the Cocky Prince - the ML's female assistant - she is a very minor character but has visible reactions to everything going on, often hilarious. I kept looking away from the main characters to see what she was doing.
In the second half (from around ep 9 when FL went back to south korea) I was more interested in the secondary couple (seung joon and seo dan) my rating dropped more because they didn't end up together T_T