Obviously all people know that his girlfriend is PARK SHIN HYE....For all the YOON/SUK Lover Jang geun suk not really fell inlove with yoona. its only a Rumour! Drama Couple (LoveRain) Doesn't make them a real couple Tsk!
JKS has no girlfriend since late 2008 to present 2014. In 2011 JKS claimed that he had no girlfriend since 3-4 years ago (ie 2008,2009, 2010 and part of 2011, he had NOT girlfriend). but since 2010, He said want to marry someday, and in 2012 when JKS and Yoona worked together, JKS recently started to say more frequently and insist that He want have a girlfriend and wanted to marry her. JKS can only feel butterflies in the stomach when he's working with Yoona (butterflies in the stomach is a symptom of being deeply in love). Also, Jang keun suk composed a special song just for yoona, he prepared also a private appointment only with Yoona, he also placed the date of her birthday in his car plate, and from He known Yoona .... always released a new album or teaser on her birthday, he also used Yoona's favorite word "kizuna" to print on all stamps to celebrate his 20 years as an actor, and othres things more . Now 2014 unfortunately, Yoona has her boyfriend, and now 2014 jang keun suk started to say that He wants not to have a girlfriend, now he just prefers to focus on his work, new projects and his loved eels. BUT .... JKS released his new teaser "Take Me" on Yoona's birthday. great!!! JKS still loves Yoona. and I think that Yoona still loves JKS, because in many interviews Yoona does not look crush on Lee seung gi. The song "Take Me" is where JKS is trying tell her (obvious to Yoona), "We will give us the opportunity we deserve to be together in our neverland and escape those burdens and promises." I guess those promises are: "JKS promises his mother have a relationship with psh", and "Yoona promises his father and company have a relationship with Lee Seung Gi". both tied to those promises that all they cause is damage and their away more and more. JKS can not forget Yoona, and she can not forget him. Besides Yoona's burden is a slave contract by 14 years with SM company, her contract is the hardest and strict.
conclution, JANG KEUN SUK IS IN LOVE with YOONA, NOT park shin hye.
shin hye is just his friend and similar as a sister.