@xxCainLightsaberxx If you go to chapter 10 you can tell that they siblings cuz he says dad when they talking about their father. And in this chapter they show him leaning over Taehyuk's crib and him getting told to get ready for school. You can also draw the lines that they're sibling since in the past he was married to Taehyuk's sister and they had a child together meaning their lineage from both sides continued.
Comment by Wangxian on xxCainLightsaberxx
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@Wangxian. Wait he married his half sister?? .... yea I guess I'll have to reread