A man who ruled an entire district with just his name alone-Shin Juhyeok One day, he happens to pick up a young sooin (Mythical Hybrid) after an accident. He plans to keep the wolf by his side only until he recovers, but before he knows it, Sooin Haewon has grown much larger than Juhyeok himself-and refuses to leave his side for even a moment. Juhyeok is already worried about how rapidly Haewon is growing... but an even bigger problem arises. Haewon's Rut has begun.