MC was the demon king and was summoned into the body of a child (losing his memory). Eventually the truth comes out that he's not the boy but the freaking demon king, and his older brother and friends have to accept it (they all still love him).
No actual confession dialogue but an indirect revelation of his identity.
MC confesses to everybody around him (found family and others) that he died and regressed SINCE THE BEGINNING! So refreshing.
Count’s Youngest Son is a Warlock
(novel only, translated)
Honorable mention: no transmigration/regression (...or is it? ) but there are confessions to the mc's friends/family about his identity as a warlock etc.
I LOVE THIS AUTHOR TO DEATH
I Became the Youngest of the Spirit Master Family
(novel only, korean only)
100/10 confessions, THIS is what I'm talking about!!! MC transmigrates into another's body and confesses to og body's family and friends that he's in fact NOT their son/brother/master, SINCE THE BEGINNING. Little to no drama about it as they accept and love him for who he is, but it's dealt with SO well emotionally
(Same lovely author as Count's Youngest Son is a Warlock)
MC transmigrated into a villainess' (who wasn't actually a villainess) body. Her father/og's beloved servant naturally learn that she's not her original self, without confession (a lot of angst) + she openly talks about it to her love interest since the beginning and at the end of the story to other characters
There's a very brief part of the story where his friends learn about his previous life (don't remember if his family ever learns about it)
MC transmigrated into a young master's body and later multiple characters find out that he's not his original self (they all accept it)
MC transmigrated into a Wudang disciple's body and I think it was at the very end/side story (that's like 100+ chapters long) but his master and friends learn about it (and the fact that he was actually their enemy) when they die/ascend. The original disciple is actually later present in the afterlife and interacts with them a few times.
(they all accept it)
MC was a knight and transmigrated into a young lady's body. She later confesses to the love interest and her friends her real identity (they all accept it)
Her not being in her actual original body is something she herself finds out later and is an important part of the plot (I don't remember if they talk about the isekai part but I think so)
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