When Jaejoong comes back to 2003

Jaejoong found out that Yunho and Changmin renew their contracts in SMent. AN accident happenned. When he woke up, he was an ordinary boy again. He is back in 2003.
(2003) DBSK debuted w/ only 4 members. Yunho (the leader), Yoochun, Junsu , and Changmin (the maknae). Jaejoong is the only one who knows the future, that dbsk once had 5 members and they split up because of SMent. Wanting to save his bandmates, he lure them to get out of sm secretly but they gone mad to him. After that fail attempt, he went to beg sm to let him join dbsk and the beauty and talented he is, SM let him. The 4 members clearly still hated him and think he is just a crazy young man, how can he gain back their trust and get them out of SM before they break APART?