1)For YunJae Petch’s 4th anniversary in 2008, they got several celebrities to sign a book congratulating YunJae on their marriage
2) Jaejoong’s 8th sister (Sooyoung) is a known supporter of the couple and has been known to autograph pictures of them; his other sisters support the couple as well, but not as publicly or obviously
3) According to a fan account, Yunho and Jaejoong were spotted on what seemed to be a very obvious date in a Japanese ice cream parlor shorty after Yunho’s birthday; Yunho personally asked the fans to delete their pictures and not spread the story around
4) Yunho’s old nickname for Jaejoong is Jiji.
5) Shortly before (as in same day, hours before) filming the couple talk for AATVXQ III, it’s widely believed that Yunho and Jaejoong had a rather intense fight about Yunho’s involvement with the ‘85 Club and Jaejoong’s displeasure with it. They’re said to have made up afterwards.
6) Rumors about their relationship: Shortly before or after Yunho’s poisoning incident in 2006, it’s believed that they became an official couple—many say that it happened on the actual night, when Jaejoong and Yunho were alone together in his hospital room for around an hour. They’ve broken up two to three times since then (first in 2007, next in late 2008, again in December 2010) but eventually got back together each time (although it’s generally believed that they were broken up for most of 2011).

*just want to share some yunjae facts eventhough maybe many of yunjae shippers already know about it..but,i'm kind feel of want to share it..