what I liked;
+ the ost, it was beautiful
+ the bromance/friendship
+ the past outfits and past Yoo Ah In's hair
+ Yoo Jin O
+ the past story before the end

what I hated;
- the romance.. it was creepy how she was a "fan" and she'd always made excuses for him when he yelled at her ;/
- the not real love triangle and their fights
- Han Se Joo. he was loud, rude, selfish, he'd always yell, and sure some of it was really directed at Yoo Jin O but he never learned from it ;/
- Jeon Seol... she fainted in the 1st eps, she always cried. she was too obsessed with Han Se Joo that she was ok with how he treated her, and she cried when she thought he'd leave her.
- they randomly added that driver as conflict and JS was always the damsel in distress
- the future story was worthless they should've focused on the past
- Ma Bang Jin was another annoying character