Treated as a burden??? He overhead his parents when they were joking and laughing about the past as a toddler. In what way was he treated as a burden during the time he was brought to the world? A moment of words from a distant past compared to the 17 YEARS where he was raised in a healthy and complete family. Not once did he think that mabye idfk his mindset is wrong? 
THINK MAN, THINK. I'd rather believe he blurted this out bc he was in panic that him mom found out about his shenanigans. But COME ON, resentment over what? He was a baby when Hyesung and Dojin decided to let go of the past and start over for their family. That said abnormal family tried to live normally to raise him properly. THEY RAISED HIM SO WELL THAT HE COULDN'T FIND A REASON TO BE ANGRY ABOUT HIS CURRENT LIFE. HE BROUGHT UP AN ISSUE HE GOT ABOUT SOMETHING HE HAD OVERHEARD YEARS AGO. All he was mad about was because he was an oopsie baby and his mother tried to abandon him. Keyword "TRIED" BECAUSE IT NEVER HAPPENED. Whilst he knew that his mom was abandoned by his grandma, at this fucking point he just said that to one up Hyesung. .                                            

		
Can u just not understand byul's perspective. He never asked to be born u idiots. Hyesung had his reason but he abandoned his kid and that's it. Who cares why? It doesn't change the fact that byul was treated as a burden.
Does it mean anyone gets to treat byul anyway the want just because they have a reason.
For fuck sake. He was a child.
It's not his fault his parents were careless. He was just born.
I hate it when people don't understand that it is not the child's fault he is thrusted into an absolutely abnormal family.
His resentment is justified.
Abort the damn kid if you don't love it.