Responses
It's not new the little bro said they were one before being born in ch2 so yes they are twins.
He said exactly they were together before their birth
Understandable? If you're talking about Siwon's disgusting twin, you might want to remember that his stupid jealousy/insecurity/hate resulted in the DEATH of the real Siwon. I wish people would stop trying to find reason to sympathise with a twisted, disgusting character... Smh
SPOILER ALERT
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.They are twins omfg, now his hatred is a bit more understandable, not condoned but I can sorta understand his pathetic self now.