This story is between the cool Ims family vs the hearty Seos family. Both families are business competitors in California, United states for years. However, not that their fathers know of..... their childrens actually fall in love with the competitor family. What should Old Mr Im and Old Mr Seo do, when they found out the truth?The IMs siblings....(from left to right)Im Taeyeon (Taengoo) - male / 23 yrs old / Jessicas younger twin brother / Introvert & mature (can be dorky at times) / VP of Ims Corp - stationed in Seoul / Graduated from University of San Francisco - classmate of Seo Yuri & Seo Tiffany / Kept his feeling for Seo TiffanyIm Jessica (Sica) - female / 23 yrs old / Taeyeons elder twin sister / Cool & capable (loves her siblings) / VP of Ims Corp - stationed in San Francisco / Graduated from University of San Francisco - classmate of Seo Tiffany & Seo Yuri / Ex girlfriend of Seo Yuri (cant forget Yuri)Im Yoona (Yoongie) - male / 21 yrs old / Younger brother of Jessica & Taeyeon / Quiet but playful at times / Study at University of San Francisco - final year, best friend & classmate with Seo Joohyun / Not aware of his own feeling towards Seo Joohyun The SEOs sibling....(from left to right)Seo Yuri (Yul) - male / 23 yrs old / Tiffanys elder twin brother / Friendly & fun loving (can be silly at times) / VP of Seos Corp - stationed in San Francisco / Graduated from University of San Francisco - classmate of Im Jessica & Im Taeyeon / Ex boyfriend of Im Jessica (waiting for Jessicas return)Seo Joohyun (Seobaby) - female / 21 yrs old / Younger sister of Yuri & Tiffany / Soft spoken and sensible / Study at University of San Francisco - final year, best friend & classmate with Im Yoona / Cares about Im Yoona and fell in love with him unknowinglySeo Tiffany (Fany) - female / 23 yrs old / Yuris younger twin sister / Lovely & attractive / VP of Seos Corp - stationed in Seoul / Graduated from University of San Francisco - classmate of Im Taeyeon & Im Jessica / Had a crush with Im Taeyeon  ForewordMore stories of their (Taeny & Yulsic) school days details will be reveal..... bit by bit. XDWhy did Yulsic broke up during their Uni days? Do they still love each other?Why did Taeyeon kept his feeling for Tiffany? Does Tiffany still having crush with Taeyeon until now?Will their younger sibling make the first step to BREAK the ice for their elder brother and sister?Will the three couples defend for their loves without any obstacle?*****************************************************************************************************************************************************************Dear all readers,Im back! I had the urge to create this story "I left my heart in San Francisco" when i happen to heard this song "San Francisco" by Scott Mckenzie from the radio. This story is meant for Taeny! XD XDI hope you guys/gals, shippers of Taeny, Yoonhyun, Yulsic will support my story and stayed tune with me (subscribe). **DJ... PUT IT BACK ON** XD And lastly..... I hope to get your COMMENTS OR SUGGESTIONS, tell me how much you like it and what you wish to see on the next chapter....Not forgetting to GIVE THIS STORY A VOTE, if you like it. XD XD XD