I didn't expect much from this series going in. I was just binging anything with Park Seo-joon in it. I was surprised to find such a complete cast. Seo-joon's role is a complex character with so much depth and yet pales in comparison to Ji Sung's role. I've seen D.I.D. series done before, but never as well developed as this series. Ji Sung really does deliver 5 completely different roles and does it flawlessly (yes, there are supposedly 7, but only 5 really stood out). I definitely watch kdramas for the incredibly attractive men, but I'll give credit where credit is due. Hwang Jung-eum was spot on in her delivery. I watched this 8 years after it's release and was still blown away by the OST and production quality.