The main character is smart and can be said to be unreadable at all at the beginning of the episode I thought he was just an ordinary detective but all the cases he handled did not think that he was the one who made the problem and I always asked what happened 28 years ago but everything was revealed when I found out I was very surprised and felt sorry for the children who became test subjects and it was all the work of rich people who wanted to live forever. namgong min acting no joke i think.