Kyuhyun had only his mother, his father had died when Kyuhyun was just 3 years old, but left him and his mother a ton of money, which could last them their lifetime till Kyuhyuns grand children.

Kyuhyun and his mom, Yoona , were never close, they never bothered each other nor cared for the other.

That was till Yoona Decided to marry her new boyfriend, Choi Siwon.

And maybe Siwon liked Kyuhyun more than Yoona.