They met when they were young and had a deep brotherly love. Luo Zhengyang developed a feeling called love for Tan Taotao. Tan Taotao didn't know how to respond to his good brother's emotions and his own heart, so he ran away. After many twists and turns, they finally got together, but separated due to a misunderstanding. It was impossible for them to be together again. Tan Taotao was an undercover agent sent by country A, and Luo Zhengyang was his cold-blooded instructor. They came closer again and again and missed again and again. When the end of the world comes, how will they get along? Will they be together?