End of line of sight, 30 degrees

Chapter 30.1
Chapter 30
Notice.30.2
Chapter 30
Notice.30.2
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?