Was initially interested because there aren't that much AI stories in kdrama and the synopsis seemed good. And if at first, over the course of the first 4 or 5 episodes, I thoroughly enjoyed the story and the main couple, the plot quickly starts losing steam and feels rather empty. Let's not talk about cheap plot devices that feel very Deus ex machina with the chairman's fake dementia turned real two or three episodes later. Human Nam Shin's return, while well executed, arrives too late for viewers to actually like him which is a shame because there was so much potential. Also didn't like his character treatment: between him being portrayed as bratty, borderline psychopathic when it's the result of his traumas and his "redemption" arc spanning over the 2nd half of the finale, it's lost potential. As for the chairman and his not so loyal right hand Seo, they make very caricature-y villains, definitely destroying the drama's dramatic side. What should break the viewer's heart feels cartoon-ey and over played. The female lead seriously lacks development as well and while she isn't necessarily that bad to watch while she supports Nam Shin III, her behaviour starts being annoying in the last episodes, once again killing the dramatic effect. Seo Yena's storyline wasn't bad in itself but it was constantly coinciding either with bad plot devices or with the clowney acting of the bad guys. Overall, just like Human Nam Shin character, it's wasted potential. The only saving grace of the drama was Seo Kang Joon's acting, along with Ji Young Hoon's character. Overall disappointed with characters treatment and how loose the plot was. It's not an entirely bad watch in itself but if you start this drama, don't go in with much expectations.