Execution is not the best, and a little outdated but the story and script are done well.
Basically, I loved the brothers dynamic and even beyond that human experimentation is my favorite topic that's why I love Japanese stories like Final Life . But Final Life is shot well and it's more recent so naturally more stunning but Fallen Angel has a kind of indie feel to it.
The story is basically about people's obsession with intelligence, and a lot of Asian dramas deal with this topic in a phenomenal way like the Thai series Gifted and Japanese Final Life I mentioned earlier.
Basically two brothers are living ordinary lives when suddenly after having disappeared when he was a kid, the youngest brother appears all hurt and not in great shape.
And then there are people who want to capture the youngest brother so the older brothers end up being forced into abandoning their lives so they could go on the run in order to save the youngest from the antagonists.
Anyway, I really thought the actors on the whole did a solid job and the script was good if not outstanding.