At the initial plot was fine but it came down to the default Korean drama template where 2 guys are falling and fighting for a girl (which I have always found silly and annoying). You would find such elements in dramas like boys over flowers, Jumong, Kingdom of the wind, the good Doctor, Beethoven Virus, Scarlet Heart:ryeo, amongst others I stopped at episode 13 because I could predict the end. They really need to infuse better cinema flavours into their dramas. As much as I like Korean drama, alot of times they always have this common element which for me is silly.
The second lead was relegated to the background after investing such dramatic attachment to him at the beginning.
The so called programmers whose codes are not more than 10 lines. If you are gonna use the python language, there are many source codes on the internet to help you make look more guenuine.