Time Travel: Starting Contract with a Black Dragon

When Ye Yun woke up, he found that he had become Keyar, the Healing Hero, and activated the monster contract system at the beginning. What should he do if he is weak? We can only catch monsters! Before the kingdom princess Freya turned herself into a slave, it was very reasonable to contract a black dragon to protect herself, right? "Why does Mr. Keyar have so many monster subordinates? It's too scary!" "His monster slaves can bulldoze entire continents, Keyar Ye Yun, the eternal god!" "Princess Freya, Princess Nolen, as the king of Jiora, I order you to marry Keyar Ye Yun!" Ye Yun, who leads all races of monsters, enjoys great praise from the world, but he is also very helpless about this. What should I do if I accidentally end up with too many monster wives and they won't let me marry a human princess? Waiting online, quite urgent. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.