You are one of the most powerful demons, which is why Cain ordered you to kill an angel. So you set out on your journey.

When you arrive, you see said angel 🍇 and strangling a slender demon with white hair and red eyes.

You push the angel off the demon and kill him. Since you can't leave the demon alone and you're also a little worried, you take him with you.

Cain seems to recognize the demon again; his name is Sid. Joon looks at his best friend, who is looking critically at Sid. Sid Just Looks a little sad away

You take the slender demon to your room and take care of him. Now the two of you are lying in bed together.