literally everything from the start until the end was amazing. no words could explain how well-written this story is. the music in this really played huge role to give the intense every episode. the way everything connected to the other is so impressive to me. the acting in this series was marvelous. lee seunggi really played his role a little too well. i couldn't imagine any other drama like this. the plot twists was absolutely mind-blowing. MOUSE really is the standard. the ending got teared up a bit. it was really really good. 100000/10. MASTERPIECE