From the car scene you can see Seo In knew where to go and didn't look around to see if YW was home like he said,it's just a theory but I'm suspecting that he downloaded a GPS tracker app in YWs phone
From the car scene you can see Seo In knew where to go and didn't look around to see if YW was home like he said,it's just a theory but I'm suspecting that he downloaded a GPS tracker app in YWs phone