Responses
There is NO WAY a 6 grader can travel alone and meet the grandma. So Dojin probably introduced them himself.
So this SECRET communication between Dojin and his inlaw is more than a Decade already.
Actually if you remember, byul accidentally saw how dojin was contacting his mother.
I will get really mad if Dojin just get away with this without suffering a HELL LOT. No matter how you look at this situation, this is entirely his fault. I believe in this part his fault is greater than Hyesung's mother because if it weren't for him, Hyesung and that crinkly oldie wouldn't have to cross paths EVER AGAIN. And now he did not only hurt and betrayed Hyesung with his stupid thinking, he also brought in Byul (accidentally and unintentionally, without him knowing or not I don't really care) into this messy situation causing Byul to spat out those harsh words to his poor momma because he really didn't know anything. This Dojin peabrain guy that they all thought was so cool better grovel at Hyesung's feet while sobbing his guts out looking a complete mess or else there will be no redemption happening