I like the story at the beginning. The drama tell me about the other side of mathematic and a little bit remind me of Sky Castle (dark side of Korean education system). The cinematography is good tho. The Cast acting also superb. I like how Lee Dohyun and Im Soojung potray someone who have traumatic disorder. But, in my personal opinion, i dont really like about their romance (even their start to have relationship at legal age, but i feel little comfortable).. The story at final also feel so flat. But thats okay, this drama still worth to watch