Waiting for each other for ten years in a crazy survival system.
Shuang Jie is a commonly used word in online novels, which means that both protagonists are pure in spirit. Purity means pure innocence, no stain, no selfishness; A truly pure person is a person who has experienced the baptism of life and still maintains his original heart. From "On Ailian": "If you don't touch the mud, you won't be a demon."