Very brief synopsis:
The female protagonist, Go Eun Ha (played by Han Sun Hwa) is a struggling children's content creator, who by chance gets tangled up with a firm run by a former gang boss.
The CEO of this company, our male protagonist Seo Ji Hwan (Um Tae Goo), wanted to break free from his mobster dad and ratted him out to the authorities years ago, sending his dad to prison.
After some initial misunderstandings, Go Eun Ha and Seo Ji Hwan end up falling for each other, but there are of course other players on the field, as well as the struggles of running a business as a former mobster.

First of all: This was a rather fresh series, a bit different from a lot of other ones. Stands out a bit like how "Knight flower" also did for me, even if that is a different genre. It's kind of like they don't view/take themselves so seriously.

My Sweet Mobster has got charm, humour, romance, and some action and suspense.
It also showcases what I imagine is a very real struggle: to turn your life around as an ex-convict. This series are in a non-preachy way showing that they often are very normal, compassionate human beings too.

Cast was brilliant, and the main couple worked well together - although I would say Um Tae Goo probably impressed me a little bit more than Han Sun Hwa, as I also think his role was more challenging to portray.

I don't always notice the music, but this time I did, in a rather positive way.

I have very high standards for "rewatch"; it is mainly only a topscore of 9 or 10 that means I myself would consider rewatching. This lingers between 8 and 9 on rematch value; I have just finished, so I might reevaluate when digested my impression a little more.