Their grandfathers were close with each others, they married their son and daughter. Which makes Gong Yoo and Kang Dongwon cousins.
They found out about that on 2004:
+Kang Dongwon's aunt/uncle is married to Gong Yoo's aunt/uncle
-Whoa.. That's cool..
-Hul.. I'm so jealous of their families..
-Amazing..ㅜ Is that the reason why Kang Dongwon introduced Ha Jiwon to Gong Yoo?
-I know that.. He's my boyfriend, there's no way that I wouldn't know about this simple fact about him..
-Ah.. No wonder why Gong Yoo came to our wedding.. I got married to Kang Dongwon..
-Then.. are they cousins? That's amazing..
-Whoa.. I can't believe Kang Dongwon is my husband's cousin..?
-I've already heard about this since a long time ago..
-Huk.. That's unbelievable..
-I'm so jealous of those who can brag having Kang Dongwon and Gong Yoo as their cousins..
-I can't even imagine what is it like when they hang out together..ㅠㅠ They're way too handsome..
-Whoa.. The genes are amazing..
-Whoa.. I can't believe this..
-Hul..ㅠㅠ Such a nice combination..
-Oh my goodness.. Their genes must be really great..
-Wow.. Imagine how surprised they were when they first found out about this..
-Whoa.. I want to be their cousin too..ㅠㅠ
-What an amazing family..
-They have one other thing in similar: They both are handsome..
-Whoa.. My eyes will melt if I see them in one frame..
-Hul.. This is my first time hearing about this..
-No wonder..
