Night on the shore

(Kim Eui Hyun and Eui Young were related only through their Alpha father, but they had different Omega fathers)

But when Kim Eui-yung was seven years old, his father took the boy away because he didn't have enough money to support the child, especially since he was literally giving his body to Yeo Tae-ju. When Yeo-yung's father took the boy, they left for America because Yeo-yung lived there, and 12 years passed. Kim Eui-hyun and Yeo-ju had a son, whom they named Hae-wol. Over time, Kim Eui-hyun even began to forget his brother. Yeo-ju, in turn, still couldn't forgive his brother for giving him up to his father and held a deep grudge against him.