End of line of sight, 30 degrees

Notice.30.2
Chapter 30.1
Chapter 31
Chapter 30.1
Chapter 31
To Do-Jin, Yeon-Woo was just an unusual kid. However, from one day, Do-jin's eyes were chasing Yeon-woo. Why can't Dojin take his eyes off him? And what is that feeling that Dojin feels?