Most major private networks provide a "Web TV" or "Live" section where you can stream current series for free after they air. 100% legal and direct from the source.
ANT1 is the largest private network in Greece. While their full premium library requires a subscription, they offer a generous "Catch-Up" window. ellenikes seires Online Free
While searching for , you will encounter sites promising "all episodes" but delivering malware. Avoid red flags: Most major private networks provide a "Web TV"