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In 2012 DH went to China and filmed a drama called "Love Actually", co-stars Joe Cheng (Taiwan actor) and Li Yi Feng (Chinese actor). On June 30, 2014, various chinese media reported that Li Yi Feng spoke about his past relationship with one of his co-star who is from overseas. He said that he went to her home country to look for her but was rejected. Some reports said that he admitted that he was referring to DH.
Around mid 2012 - After "Love Actually", DH returned to Korea to film IRIS2.
Jan 2013 - There was a photo taken by a fan, of Li Yi Feng in a train (subway) in Seoul.
May/Jun 2013 - DW ended his last relationship, as mentioned in his interview in Dec 2013.
So most likely, both had someone else in their hearts in 2012 but both broke-off in 2013. Concidence or fated to love?