Responses
The only one who know that Jeongyoon family knew about the relationship is Chaeheon. Our MC is so gullible that the whole family is worried and confront Chaeheon first "behind his back". If you read back on chapters when Jeongyoon mom's so against him moving out with Chaeheon, at the same time Chaeheon also trying to win their hearts by visiting a lot even Jeongyoon kind of suspicious on what's gping on but never really think about it
Aha thank youuu:***
Aren't they already know? I mean his mom told him we can not yet tell the fiancé's parents the relationship between you two. So it means they know and our gay couple know that they know too.