The part I like most is that
1. They're ACTUALLY acting like children their age
2. The backstory is PLAUSIBLE and there's no stupid reason that MC couldn't get to him like the magically-out-of-the-blue-move we see all the time
Tbhhhhh I feel Seunghyun is a lot more mature for a 4th grader but the way the backstory was written was actually rlly clever asf like the mystery was mysterying
Some kids do just naturally have a more calm/mature personality. I was one of them, it just depends on your environment and influences. Like Seonghyun's role model was his brother.
He was also not closely supervised by his parents. He'd probably been making his own decisions and taking care of himself for a while already at that age.
Bruhhh my heart broke when they where both crying trying to find each other..daamn adults theyre just kids for fucks saake..stop yelling...
I really love this backstory