1) Casting and Acting
The supporting actors--Mom, Chairman, street vendor gang, and loanshark hyung--are the true gems. They contribute the best they can given such minimum significance and poorly written plot. I quite like Jangkyung's actress as well; she has managed to avoid stereotypes of annoying 2nd female lead. Too bad, second couple pairing doesn't have much sparks here. The responsibility falls on Seon Minjoon's actor though. His acting is just too flat; you won't know what he's feeling toward anyone unless he spits it out.

Regarding the leads. I was startled when the drama revealed Seolbi's age. While I can't find fault on Seohyun's acting, she definitely doesn't look in early 20s. Don't get me wrong, Seohyun is young and pretty af. It's just that she naturally carries mature elegance aura in her face. I think she shines better if she takes roles whose are in mid or late 20s. I can't say much about Na Inwoo. So far he's acceptable, not exceptional. Maybe he still needs more experience to add something unique to his performance.

2) Plots
I'm curious enough about where the main plot is heading so I finished all the episodes. I skip a lot though, like maybe 40 to 50 percent of all scenes. The pers conference scene is awkwardly executed.

3) Characters
The production team strangely is willing to pay some additional actors for nothing. For example, you can take Janggeun (Jangkyung's brother) out of the story and it will not change anything. Same with street vendor gang. There are characters who don't really serve any addition to the plot.

4) Romance
Imo 'fated since birth' is barely necessary; they should spend more screentime on cohabitation arc instead. And I am disappointed with the love triangle--this troupe is too outdated. If only they make Seolbi and Seon Minjoon's relationship more platonic, it will definitely be more enjoyable for me.

5) Music
I don't usually pay attention to OST but I do in this drama because it is Junsu.