Red Thread (2009)

Alex Sung is blind and on a quest for revenge. Seven years ago, his wife was killed and he lost his sight. His investigations lead him to prominent businessman and philanthropist Kong Wah and his family. Alex infiltrates the family, uncovering the skeletons in the closet of the Kong family. Nothing and nobody are what they seem, including Alex himself. The series explores the idea of good versus evil, in particular Alex's struggle between good and evil. Does taking revenge, extracting justice from someone evil turn a good man into a bad one?