Responses

Okay, so to sum it up, Jung-yoon thought his family didn't know he was in a relationship with Chae Heon, but they did know about their relationship, and he doesn't know that they already knew about him and Chae Hoon, and his family wants to keep it a secret that they already know about his relationship? I'm just trying to make sure I understand the reason for the secret and why they're keeping it from him
What secret are they keeping from him, and why is it better to keep him in the dark about it?