After the first three or four "confusing" episodes, 'Signal' provides the outright most amount of emotion and attention-to-detail a drama could ever give. Phenomenal acting by each single member of cast alongside a confusing-at-first plot which turns into a masterpiece, and a production quality that Hollywood would be proud of - it is a definite watch for anyone who enjoys these type of shows. I believe a second season has already bee made and is waiting for release, but if I am wrong, I still believe that a second season should be made - although it's been almost 5 years!