Nam Hae-Sul, who is handsome but famous for his dog-like personality, is only nice to his childhood friend, Yang Mi-Ru. "It's clear that he's nice to me because he likes me!" But is it really like that? Mi-Ru has no idea about Hae-Sul’s true feelings. Then one day, she finds out about the "black heart" that he harbors! Cracks are starting to appear in their 10-year friendship...! The wild growth story of a wolf boy and an innocent girl! (Source: Naver, translated) Note: Includes two extra chapters.