They let Suga go, after their mission was done of killing Wendy.
When he goes to find the people, everyone was gone. They all disappeared so he couldn't kill them.
He goes to the room she stayed in.
There was a letter, on the floor.
He opens it, Wendy wrote it.
Dear Min Yoongi,
You were the best thing that happened to me.
I don't regret being with you.
I knew I was going to die, there isn't a way to stop it. But if I had to choose to die, I wanna die in the persons arm of whom I love.
I knew you were a vampire. One of the people here told me but i don't care.
If your reading this it means I have died. Promise me you won't die. That you'll live, you won't kill yourself. Do this for me and us.
I love you.