Reading the synopsis I found the plotline very interesting, watching the first couple of episodes i wasnt very happy about the show, i think that the first 3 or 4 episodes were quite boring and i thought i should drop it, also i didnt really like any of the main characters, BUT after episode 5 i was very invested (especially about Joo Won). So i am glad i continue watching it .
The characters were at times really annoying but the storyline was good to keep me going. At first i found Eun Sol super annoying but episode after episode she grow on me! I thought that the storyline between Ji Young and Yoon Soo was going to be my favorite but they were really boring and i didnt really like them. Joo Won was my favorite character and her story with Ha Jun was the most interesting and the main reason i kept watching. Also Tae Jin was such a great character and i am happy we get to see a character with a storyline like this.
The character development for some characters was great and also the professor was a great character too.
The friendship between Joo Won and Eun Sol was the best thing in this show (way better friendship that Eun Sol and Ji Young and they had less screentime).

Good show, with so much more depth that i thought.