(I finally fixed my mistake on Taeju's name, sorry!)
The Sa brothers decided it was a great idea to introduce their children to each other, so they knew that they had a cousin, Beom and Taeju agreed to this. They all met up in Dowon's apartment.
They had fun, talking and asking how their love life was as their children were playing with each other. The two seemed have fun together as well, drawing the cartoon characters they liked, sharing toys, all the childish things. Taeju noticed something between the two, joking during the conversation about how similar the two looked with each other, almost identical. The only way to tell them apart was their eye color, Sa Dojin's child had brown eyes and Sa Dowon's child had green eyes. Though it actually sparked some curiosity.
Beom: "I didn't notice that earlier..." *He mumbled
Dowon: "Well, maybe it was a coincidence?"
Dojin: "The possibility of us suddenly adopting children doppelgangers of each other is unlikely, Dowon."
Taeju: He nodded in agreement. "Its strange how similar they are..."