I don't want this reincarnation

[FOR OFFLINE READING PURPOSES ONLY!!! THIS TRANSLATION IS NOT MINE!!! CREDITS TO ORIGINAL TRANSLATOR!!! THIS BOOK AND ALL CHARACTERS ARE NOT MINE, CREDITS TO ORIGINAL OWNER!!! PLEASE DO NOT VOTE!!] I had a supporting role in a modern fantasy. The loyal dog of a villain with an angel's name, Cheon Sa-yeon, and an unfor...