A retired Hong Kong hitman, A Hoi, and his senile Mother live a mundane life on the rustic Grass Island near the Hong Kong/China border. One day, A Hoi’s Chinese apprentice, Xiaoma, arrives in disguise, tasked to kill A Hoi for his unresolved feud with her triad boss. Rather than engaging in violence with his apprentice, A Hoi invites her to have dinner with him and Mother. After the meal, Xiaoma reminds A Hoi of her mission. A Hoi leads her outside the home, away from Mother, to discreetly knock her out. Late into the night. Xiaoma wakes up and realizes she had missed the last ferry. Grateful to A Hoi’s mercy, Xiaoma offers to allow A Hoi to escape before more backup hitmen arrive. Instead, A Hoi asks Xiaoma for one favor.