Huh? But they know already from the conversation between seme and mum.

Hold up

I think I remember they found out but didn't tell uke that they know do the whole family knows they are together but uke doesn't know they know? Am I remembering right. Or is it still only the mum and sister who know my memory is kinda ass

Chae heon already told the family that they're together but left Jeong yoon in the dark