Cradle of the Tiger

Yoon is a broke student working tirelessly to turn his life around and get through medical school. Though they're estranged, Yoon can’t look away when his father’s debts catch up to him. In exchange for his father’s life, Yoon agrees to work for the gang after he graduates, losing all freedom outside of his classes. With all that time together, Yoon can’t help but get to know Tae-Beom. And he hates to admit it, but the attraction he feels for the boss might go beyond just pheromones…

(Source: Tapas)

Note Includes one extra chapter.