Donghae and Jessica were dated(together) for 3 years already and they decided to get married.They had 3 childs, 2 girls and 1 boy

1st: Lee HaeYeon(Girl)
2nd: Lee YeYeon(Girl)
3rd: Lee SooHae(Boy)

The names:

HaeYeon (DongHae the Hae and Jung Soo Yeon the Yeon)
YeYeon (Yesung the Ye and Jung Soo Yeon the Yeon)
SooHae (Jung Soo Yeon the Soo and DongHae the Hae)
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Characters:


- Jessica Jung
- Pretty, Rich, Kind, Cute
- Best Friend of Yuri and HyoYeon
- DongHae's lover
- Loves DongHae a lot

- Lee Donghae
- Handsome, Rich, Fishy Face
- Best Friend of EunHyuk
- Jessica's lover
- Loves Jessica a lot

- Kim Taeyeon
- Pretty, Rich, Cute
- Best friend of Tiffany
- LeeTeuk's lover
- Love LeeTeuk a lot


- Park LeeTeuk (real name: Park JunSoo)
- Handsome, Rich, Funny
- Best friend of HeeChul
- Taeyeon's lover
- Fall in love to Yoona (note: leeteuk ask yoona to marry him when yoona older and this is real story)


- Sunny Lee
- Pretty, Rich, Cute, Funny
- Best friend of SeoHyun
- SungMin's lover
- Love SungMin a lot


- Lee SungMin
- Handsome, Rich, Cute, Funny
- Best friend of KyuHyun
- Sunny's Lover
- Love Sunny a lot


- Tiffany Hwang
- Pretty, Rich, Look like SNSD's manager (note: take care of SNSD a lot)
- Best friend of TaeYeon
- HeeChul's lover
- Fall in love to DongHae in SNSD's kissing you (note: is not real, is fake)


- Kim HeeChul
- Handsome, Rich, Cute
- Best friend of LeeTeuk
- Tiffany's lover
- Love Tiffany a lot


- Kim HyoYeon
- Pretty, Rich, Cute, Funny, Strong
- Best Friend of Jessica
- Eunhyuk's lover
- Love EunHyuk a lot


- Lee EunHyuk (real name: Lee HyukJae)
- Handsome, Rich, Cute, Funny, Good in dancing
- Best Friend of DongHae
- HyoYeon's lover
- Love HyoYeon a lot


- Kwon Yuri
- Pretty, Rich
- Best friend of Jessica
- Yesung's lover
- Love Yesung a lot


- Kim Yesung
- Handsome, Rich, Cute
- Best Friend SiWon
- Yuri's lover
- Love Yuri a lot
- Fall in love to another girl


- Choi SooYoung
- Pretty, Rich, ShikShin (Big Eater)
- Best Friend of Yoona, SeoHyun and Yuri
- RyeoWook's lover
- Love RyeoWook a lot


- Kim RyeoWook
- Handsome, Rich, Cute
- Best friend of SungMin and SiWon
- SooYoung's lover
- Love SooYoung a lot


- Im Yoona
- Pretty, Rich, Funny
- Best friend of SeoHyun, Yuri and SooYoung
- SiWon's lover
- Love SiWon a lot


- Choi SiWon
- Handsome, Rich
- Best friend of RyeoWook
- Yoona's lover
- Love Yoona a lot


- Seo Joon Hyun (Seohyun)
- Pretty, Rich
- Best friend of Yoona, Yuri and SooYoung
- KyuHyun's lover
- Love KyuHyun a lot


- Cho KyuHyun
- Handsome, Rich, Funny
- Best friend of DongHae and SungMin
- SeoHyun's lover
- Love SeoHyun a lot 
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I'm not really know about Super Junior's best friend is who and who. But I know EunHae Forever :)