Namkoong Min was absolutely phenomenal as he is in all his dramas like Doctor Prisoner, Veil, Awaken. The rest of the cast was good too.I'm glad it didn't have the typical office romance you see in office dramas. The plot and flow was executed well from the 1st episode to the end i actually binged it all! Particularly loved the undercover agent Jung Hye-Sung (Ga Eun) her vibes were really great and funny . Loved how he always teased Lee Hun-Ho (Seo Yool) and end up working together in the end One of the best dramas I've ever watched for sure.