They also try to fight hardships with their restaurant or pub, and the vibe was similar.
I know the cast in this is more young, inexperienced and this one seemed less mature, it could be great for those who are searching for something similar.

The relationship is from hate to love and the friendship is great as well. Although it can't beat Itaewon class for me, it is similar in many ways, has a nice ost as well and I think the actors did a good job. This one is more relaxing :)

The female lead has the same job or talent, haven't seen it but gives the same vibe, I don't think she is that quirky here but it looks fun as well.

The male protagonists are basically great at fighting, investigating and acts like pro agent. Although in the Age of Legends the female lead is badass, their chemistry is almost the same and very beautiful. In both dramas, there are missions and undercovers and lots of action, so it has a similar vibe.
Both male leads are also hot as heck as well as the female leads. It also involves drama and issues with the family of the other lead, such as murder or something uncovered.
In both dramas, there is a beautiful relationship and friendship as well.
You will love it.