this is probably like do-hoon wants to see how badly yu-won wants him after seongmin disap...

this is probably like do-hoon wants to see how badly yu-won wants him after seongmin disappeared, that's why do-hoon was like that (suddenly busy, came home late, etc) he knew yu-won will go crazy like that and feel like he got no one anymore and only do-hoon now. But once the girl appears do-hoon probably start like "aw shyt another pests i can't let anyone close to yu-won except me anymore" BUT IDK THO, the story is very cool and toxic tbh :O