Alpha Password

Comets hit the earth, the land almost not exists, and the human-built aerial city,the "Rainbow Bridge", became the only suitable place for human beings to survive.But the "Rainbow Bridge" only houses people who have not been harmed by the disease, and other races can only choose to stay on earth or face death.
The Wood family are the designers of the "Rainbow Bridge" , where they have the supreme glory and status.
Jenny, the Wood heir, grew up with her adopted son Allen, who loved Jenny, who has protected her since he was young.
When humans forget about vampires, a strange virus begins to spread between humans.
Allen saves Jenny in a vampire attack, while Allen learns that he is a werewolf.The incident brought destruction to the Wood family.
Although knowing that the appearance of the vampire is very strange, Allen and Jenny hide their identity in order to find out the truth.
Just as Allen and Jenny become lovers, Allen's ordered Wolf spouse finds them. The Wolf mate brings him back to the Wolf clan.Allen is surprised to know that he is the next Wolf alpha.
The survival of the Wolf clan is threatened by strange creatures, and he must take the responsibility of the Wolf king.
At the same time, the vampire virus begins to spread widely on the "Rainbow Bridge", with Jenny's life under threat, and he needs to find the truth.
Which one did Allen choose?
How will he solve the fatal trouble one by one?