Blade Of Retribution

on the day that kendo champion shiho decided to help out his single mother run a gukbap restaurant, he received news that his sister, shiyeon, committed suicide. during the funeral, shiho realizes that something was wrong. it wasn't a suicide, she was murdered. in order to learn the truth and get revenge for his sister's death, shiho lifts up his sword once more to begin a war of his own.