Watch Sethupathi full movie online Movies123. Watch Sethupathi 123movies online for free. Sethupathi 123Movies: Sethupathi, an inspector, investigates the murder of a cop and finds that Vaathiyar, a big shot, is responsible for the killing. He arrests Vaathiyar, but an unfortunate incident that has a connection to the case he is investigating, puts his career in jeopardy.