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.I just read it in the Novel updates, ( this is copy and paste)
According to my very quick MTL, even at the end, Vincent didn’t get his memory back, as it was erased cleanly, leaving no emotions, thoughts, minds, or anything else.
However, he had a looming afterimage of someone (Haylinn’s mom), asking him to make her happy.
In the last chapter of the main story, when Vincent and Haylinn visited Haylinn’s mom’s grave, Vincent said that it was Haylinn’s mother who brought him to her:
"It's your mother who sent me to you, Haylinn.
Basically she is his daughter, he has a memory loss and the exchange of the memory loss is so that the daughter can go time travel in the past.
He is willing to sacrifice himself

[Thoery]
Let's see hobin father didn't appear right?
Maybe hobin parents divorced, And his father took his brother and hobin was took by his mother,
And the mysterious guy look like a delinquent right? Maybe the father of hobin was shitty so that's why they divorced . That's why the guy turn in a delinquent.
Anyway he look like a secret love child of hobin and taehoon LOL
I am really curious who's this dude
I love Ellie and Ohmi but kaname?
His the best boi, srly, Best boiiiiiiii
I wuv him
Ellie can have Ohmi and We, the fans can have kaname(づ ̄ ³ ̄)づ