The person Owen liked from the very beginning was Seraphina.
It was only after falling for her that he noticed the inconsistencies in the sisters' behavior and realized something was off.
When Owen confronted Seraphina for the truth, she didn't admit it outright, but her reaction gave everything away.
Under his persistent questioning, Seraphina finally confessed that she and Jocelyn were indeed two different people, begging him not to expose them.
Even though she didn't want to do her sister's coursework, she couldn't refuse their parents' demands.
She simply had no say in the matter.
The Thorne family had money, but Seraphina was penniless.
She had tried to rebel against her parents before, but failed.
Owen didn't promise to keep her secret, but he didn't explicitly threaten to report her either.
Later on, the more he looked at Jocelyn, the more he despised her.
That was because he realized just how drastically different the Thorne family treated the two girls.
Seraphina did all the grueling work, while Jocelyn simply partied and enjoyed life.
Their parents' favoritism was completely out of control.
The one he wanted to date was Seraphina, and the one he actually courted was Seraphina.
It was just that everyone else mistakenly thought it was Jocelyn.
Unfortunately, somehow Jocelyn found out about their secret relationship.
Jocelyn used it to threaten Seraphina, completely unaware that Owen already knew the two sisters were playing the exact same role.
Forced into a corner, Seraphina broke up with Owen.
In retaliation, Owen forced Jocelyn to leave the country.
As for Seraphina, she was sent away by her family.
Before she left, she begged Owen to let her younger sister off the hook, which left him utterly disappointed.
So much so that, even after all these years, he never bothered to ask about Seraphina's whereabouts again.
Seraphina had chosen her family, which inherently wasn't wrong.
But Owen was devastated. He felt a deep sense of regret over his brief but earnest feelings for her.
It was a past romance he preferred to keep buried.
If he didn't know the answer himself, Owen certainly wouldn't.
However, knowing Xavier's personality, he most likely fell for Jocelyn.
Xavier refused to accept it. "You said the two sisters were always playing the same role, so why didn't I ever notice?"
Whenever he was with Jocelyn, she always acted the exact same way. Xavier prided himself on knowing her pretty well.
Owen shot him a meaningful look. "Are you absolutely sure there was nothing suspicious about her behavior?"
"…Now that you ask, I'm not so sure," Xavier admitted.
Was Jocelyn really that flawless at hiding it?
Not necessarily.
Even though she was always the one showing up for dates, there were inevitably times at school when Seraphina took her place.
Whenever Seraphina was around, no matter how hard Xavier tried to take her out to eat, she would never go, offering up every excuse in the book.
She wouldn't even touch the treats he bought for her.
Back then, Xavier didn't sense anything wrong. He just brushed it off as his little girlfriend's temperamental quirks.

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