I was really expecting that character would develop into something better than presented in the first episode. Although he is presented as a smart kid, there so many stupidities around that I can't even count. His own old phone wasn't secured, so that woman from banana club could read it without a problem when kidnapped Gyuri. Gyuri is a smart one, she went to school during the night time to hide money, while Jisoo is complete retard, went to check money during the day time, also having money in his backpack is also completely dumb idea. I mean as the one who designed a schema for a sex trafficking security, I've really expected more from him. Once his phone number was exposed to that detective (when she called the Uncle), he didn't even bothered to change the phone. Also when Gyuri stole his phone, he could've delete all the data remotely by find-my-phone service, or similar. It such a basics, I mean Jisoo was mumbling to those gang guys some IT stuff about DNS, so if he knows basic of IT networking, he should know basics of security. Every episode is full of such incompetent decisions, this really kills the vibe, also makes me to hate this character even more with each episode. Either this script been written by incompetent teenager, or these mistakes been done intentionally for simple minded people. Idk. But this is one of the worst korean drama I've watched so far, two characters which are really ok are Lee and Cho, rest of the crowd are useless people who doing stuff they don't understand nothing about, especially that detective.