They were twin orphans (I don't remember correctly if they were orphaned or not), they were together until they graduated hs and went separate paths like the youngest went to the military and the oldest idk what he did but ended up intertwined with the Oyama family then left Japan and came back to korea and became who he is today.
Yisoo's joining the military and dokyeong went to Japan to join Oyama. they're twin orphans. the old man is not their real father
OHHHH I GET IT NOW
WHAT??
Wait I'm confused are the twins not from the same father?? So why is the dad acting distant to the other twin They are literally from the same Dad.