I finished Startup yesterday and so glad that I did. I was hesitant and wanted to give up when I saw other reviewers giving 1/10 for Story. I like the story and can totally relate to Nam Do-San character - a geek pursuing a dream who knows he is most familiar with coding language as compared to human language (I worked for IT startups for 10 years and I see traces of him in some of my colleagues). He cried a lot, was insecure and a tad bit of entitled but emerged as more mature, more assured and stronger towards the end of the drama. I don't quite get why there is a 2nd lead syndrome in this show. Like what HJP said, he waited for many years to contact Seo Dal Mi again but Do-San showed up the very day he read those letters. Nam Joo Hyuk is a fantastic actor - from Weightlifting Fairy, the Light in Your Eyes, Startup - i simply enjoy watching his shows :)