In the novel (ch.570), MC reveals to his people that he's the emperor from 100 years in the future and talks about his life to them (ch.574)
FL talks to ML about her regression literally at their second meeting, although he didn't take it seriously. She later talks to him about it in more detail and he eventually regains his memories of the past himself
ML finds out that she's a demon pretty early, but she only talks to him about herself in detail in novel ch.94
The uke time traveled back to the past and talks to the seme about it in ch.36
ML finds out about FL's 2 previous lives (as the goddess of darkness and in Korea) in ch.61-62, then in ch.73 the whole main cast finds out about her being a goddess
It's an unserious comedy lmao, but the main cast eventually gets to learn that MC transmigrated into their world and that she's actually a man irl
In Ch.39, FL told her parents about her ability to enter people's dreams.
The dragon as of now is the only one who knows about her reincarnating from Korea, we'll see
In manhwa Ch.18, FL first tells ML about the future as if she just had a dream, then in Ch.101 she tells him the whole truth (about her previous life in Korea and about the whole future)
The dad has nightmares about FL's previous lives' deaths and at around novel ch.217 realizes that they were true and feels like he should die to repent
She tells Aggie (the attendant) that she "can see the future" (despite having regressed) and talks to him about her previous life's events this way.
At around novel Ch.130 the father finds out about the regression stuff
Margrave’s Bastard Son was The Emperor