
Spoiler...
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.After looking at the raw, I think I kinda figure out the big secret. Correct me if I'm wrong. Min gun Lee's sister is actually his brother who had a sex change, but it seems that he ran away from home when he was younger (I'm guessing that he came out) after arguing with their parents. Years later he comes back as his sister to take care on Min. On top of that, (from a photo) Min's sister was actually in a relationship with the twins dad before his surgery, helping the dad raise the boys. I think that's the secret. And the twins known about him along, that probably why Han Kim rejected him in the first place.

Seems like a super unnecessary and weird thing to add, it could've just been his brother and stayed his brother, dunno why the author had to make him become a girl, it doesn't add anything to the story. Kinda frustrating, especially cause I was excited to see what the secret was only to find the author drop the ball like that, but whatever. To each their own, one less manga to read isn't the end of the world ¯_(ツ)_/¯

sweet soul pls reveal the raws link *bows*

http://www.manhuaren.com/manhua-shilianzhonga/
There you go (=・ω・=)
Oh snap! Commence the love triangle!( ̄∇ ̄")