Shop for Killers -- Kdrama.

Very good! Sort of a Hanna feel to it, with the young girl adopted by her uncle after her family gets slaughtered. He raises her in a secluded reinforced home for ten years before the shit hits the fan. Turns out the uncle runs a munition shop for killers and the series begins with news that her uncle is dead from suicide. The funeral service is barely over and the young girl discovers that she is a target for assassination. Slowly she discovers her uncle's secrets as the bad elements who were also customers of the shop, begin to hunt her down. Turns out they were previously restrained due to a code among thieves and murderers, but with the uncle dead, it's open season.

So, as we run through the present time, with all the baddies storming the reinforced house, we get flashbacks to see what her life was like growing up with an uncle who withheld a lot of information from her, and only peripherally taught her self-defense skills. In between remembering the things she learned that help her survive her present quagmire, she also remembers events from the past that gives her clues to explain why it is all happening. Lots of action and suspense.

It's on Hulu. Lee Dong Wook plays the role of the uncle. His laid back personality and deadpan facial features are perfect for the role. (He played the grim reaper in the series Goblin, or Guardian the lonely and Great God.)