In hell, because they are not helping at all... Even if they knew, they wouldn't be able to do anything... Even though, from what I remember, Taesung's mother once told her husband (ex-husband) that if her father interfered with Taesung and Haebom's relationship, she would defend them both and not let it happen, but what, they can't even do anything against that damned old bastard.
His mother went out from hospital and already knows why Haebom disappeared, even Taesung's father and mother know who the culprit is... Even Taesung's father himself told the situation to Taesung's mother, when Taesung went to his father's house for help. They both already know...
That's why I'm so annoyed that the author only made things worse and simply erased the existence of Taesung's parents. When Taesung sent a message for Haebom, he should have sent it to his father, not his male best friend... To protect Haebom. But I understand that the author needs more money, so she chose to maintain this kind of situation. Because if Taesung's parents had resolved it directly, this story would have ended quickly.

asking once again where tf his parents at ???