Pleasantly surprising as I watched this for Heechul but stayed for the grandpas instead. Story was so so, interesting plot line but quite stupid at some time. Love line quite lacking, no chemistry for the triangle love line. No substance built for the romance to happen. Preferred the sub stories (crime cases) than the main story. But then, the ending is surprisingly to my liking. The grandpas did well acting as flower boys, exaggerated to be funny and this depends on what kind of humor you prefer (I enjoyed it). Heechul's and Lee Cho Hee's (female lead) acting is lacking as compared to the three grandpas but still acceptable. Cannot expect too much from the other minor characters/ sub-story leads. Can binge watch it (since it is short compared to other dramas) during free time. Light and fun drama.