I really liked the two mains's acting, they were so natural and cute with each other. The story was well written, mantaining the mistery while showing bits of the answer little by little, although it becomes obvious by the third episode. I enjoyed the pacing a lot.
Also, their kisses were SO GOOD, which was expected in a series with kissing as a theme, but it being korean my expectations weren't so high, but wow they were so good for real.
The only thing i didn't like was how the FL Sol offended two dudes with no reason, just because she didn't like their appearance... It was subtle, but still noticeble.