As soon as director Yeon Sang-ho received the script for “Peninsula“, he showed it to “Train to Busan” Gong Yoo.
As soon as Gong Yoo read it, he said, “I want Dong-won to do it. It suits him well.” This led to Kang Dong-won‘s casting.
Interestingly, Gong Yoo and Kang Dong-won are in-laws.
It is said that their grandfathers were close friends even before the two actors were born.
Their grandfathers introduced their parents’ brothers and sisters to each other, and they actually got married.
Surprisingly, it was not until 2004 that the two knew about their relationship.
Source: daum