In a small, peaceful, and beautiful city in Central Africa called Serenge, Ling Xinlu lost both her first love and one of her eyes. Yuri, who signed a contract to escort the wounded "beast" back to their home country. Even for Yuri, who had lived his whole life as a mercenary and fixer, staying by Xinlu’s side — who was a mess from the fear of physical trauma and heartbreak — was no easy task. But Xinlu, who had acted like a beast trapped in a cage, gradually began to open her heart to Yuri. After her body recovered, Yuri remained by Xinlu’s side, finding the situation both troubling and oddly gratifying. And Yuri had one secret — something he could never bring himself to tell Xinlu...