Idk how I feel about this one...

In a world where dungeons have opened and some people awaken as hunters, South Korea offers an unusual deal—become a hunter and serve for ten years, and your siblings will be exempt from military service. This leads to a strange trend of wealthy families adopting children to shield their own. Yeon-woo was adopted under such circumstances, becoming a hunter to protect his younger brother, Jeong-woo. Now, five years into his service, when an unknown dungeon opens near Jeong-woo's university, Yeon-woo volunteers for a dangerous mission, ready to risk everything to protect his brother—even his life.

Yeonwoo is flabbergasted when he approaches his Hoobae, who usually watches him with a warm and friendly gaze appearing to want to get closer, but instead is met with a cold and harsh reaction. Following that day, the hoobae is relentless in his immature attitude towards Yeonwoo; shutting the elevator doors in his face, sticking post it notes with curses on his back… “It’s not like we’re in elementary school… I’ve had enough!” But suddenly, Chaehyun (hoobae), bursts out sobbing in tears before an angry Yeonwoo after being assigned to the same team project…?! “The day after sleeping with me… Sunbae you dined and dashed on me…” What kind of bullshit is this?!