Well, definitelly MSM is a more lighthearted drama, HOWEVER, both dramas have mobster main leads and have also incorporated humor in their plot.
Sooo if you are in the mood for such a drama,you should check it out. I will put more details when it ends as I will be able to compaire and contrast

It has the same concept with the app and finding love.The 1km is a short drama about 2h its whole duration.
I haven't watched it to know if it is good or not but nonetheless from the synopsis they are similar
(if you have watched LA season 2 and also want similar recs, respectfully, are you well??<---my heart)

First and foremost,MSG is airing and LIAO is to be aired.With that being said,I think that they share some similar topics from the synopsis here and what I have seen so far from the airing series.
-University related
-Ml is rich and has a company
-Related to technology

Fl in MSG is doing live videos singing and conceals her identity to ml.Similar to this that they do not know each other.
I have one more similarity but spoiler ???

(Hope we get to see LIAO in 2024! )

The vibe is very similar.
He is an ancient mythical creater while she is a girl from our world. The characters are also very similar even tho you can easily distinguish the differences.

I am not good with descriptions but give it a try, you won't regret it if you liked/like this one.
+smtg happens with the ml powers that has to do with the fl.We are still at the first episode so,Idk yet