Responses

In the original series, it is shown that Byul's grandma leaves his mom when he was just a kid to remarry someone rich but she suddenly reappeared in Hyesung's life when he was with Dojin aka Byul's dad.
For that Hyesung had severed all ties with his mom during that time. That's why it's something that would break his trust over Byul if he ever got to know.
Honestly, that is so cute. Byul is just like his mom dumb but lovable. And his mom loves him so much he baby him so much and that’s so fucking cute.
And the fact that he has such a trust in him
That’s why it’s gonna be so heartbreaking when he finds out that he’s been visiting. His mom
This is not a spoiler. If you remember in the earlier episode, it is shown that he visits the grandmom without letting his mom know. I think it’s gonna be a real tough point where his mom actually doesn’t support him for once and he’s gonna be so disappointed and betrayed.
I’m looking forward to it