Blade of Retribution

Kendo champion Shiho sets aside his sword to help his single mother run a gukbap restaurant, but his life changes when he learns that his sister, Shiyeon, has died by suicide. At her funeral, he notices signs that something is wrong and comes to believe she was murdered. Determined to uncover the truth and avenge his sister, Shiho takes up his sword again and begins a war of his own.