I posted this as a reply but reposting in case to avoid confusion. If you saw the spoilers more particularly chapter 21, I strongly believe it's not the brother tho the resemble is almost the same (even the glasses) the man on chapter 21 has freckles (you can see them in the sex scene and when the mc saw him leaving, the brother doesnt have them. Maybe the ML (?) was obsessed with the brother or had a past there hence why he wanted to fck someone that resembles him the most, I am not sure. I was disturbed thinking it was the brother haha
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I posted this as a reply but reposting in case to avoid confusion. If you saw the spoilers more particularly chapter 21, I strongly believe it's not the brother tho the resemble is almost the same (even the glasses) the man on chapter 21 has freckles (you can see them in the sex scene and when the mc saw him leaving, the brother doesnt have them. Maybe the ML (?) was obsessed with the brother or had a past there hence why he wanted to fck someone that resembles him the most, I am not sure. I was disturbed thinking it was the brother haha