In the novel, it seemed to have worked, the dragon arose and talked to him. It then noticed the humans, started charging a fireball, Sung was about to/issued a stop command and as soon as it stopped, kamish told him that it seems his time is up and that he regrets that he can't serve Sung. THEN his shadow disappears and the system tells him that the body deteriorated too much and that he can not attempt the summon again.