If I fall for unrequited love again, I'm a dog.

The precious S-class Guide, Joo I-do, was well-acquainted with unrequited love. Even if his pair, Seo Jae-heon, loved someone else, I-do looked only at Jae-heon. Until the very moment the world ended. A colossal Gate burst open, and the apocalypse arrived. Jae-heon, who had held back the monsters at the front lines until the very end, finally succumbed to a rampage. “No!” In desperation, I-do grabbed the back of Jae-heon’s head, pulling him close. He pressed their bodies together, pouring every ounce of guiding he had into him. He didn't have the strength to watch Seo Jae-heon die. He would rather die in his place. He would do anything, so please, someone—. “Please save Seo Jae-heon...