Wow, it sounded really original to me, honestly. The premise of the red lines seems fascinating and a little terrifying at the same time. I can't imagine what it would be like to live in a world like that; it would be total chaos. Based on your description, the K-drama seems very intriguing. I love that the main character is Lee Soo Hyuk; his performances are very good. The review has won me over; I'll definitely give it a try.