Drama had a lot of potential, but the writers didn't put much thought into articulating the story line.

Major issues with the female lead character, her tsundere trope fell flat, and annoying. Constant nosiness, bashing, and stalking the male lead became overbearing. It was neither funny, nor cute, her character was outright horrendous.
The age difference between the male lead and female is never explained, which is ridiculous. Considering in a flashback, she is a middle schooler and he's in police uniform, it' s mindbogglingly they think no one would give it an afterthought.
The Idea of Café Minamdang is interesting. The gang has great chemistry, and the plot should've been revolved around them. The acting is superb, from everyone. The female character is being bashed, but Its not her that's the problem, it's the writer who wrote her that way. I'm so grateful they never turned her into a damsel in distress.
The romance is forced, because Kdramas unnecessarily add romance because of their obsessions with it.
The music is fabulous. I haven't missed the entrance once because It's that good.
The re-watch value depends on how much of a fan you are of Seo In Guk.