Si Wutong and Ji Shuzhou grew up together, and became good brothers from rivals at the beginning. The two worked together to learn and train. When they were in high school, they encountered a car accident and Si Wutong fell into a coma. At this time, a system called "Price Exchange" appeared and made a deal with Si Wutong. The two fell in love with each other while realizing their dreams together. After the two were admitted to college, Ji Shuzhou confessed his love to Si Wutong, but Si Wutong did not dare to agree due to system problems. Later, due to the two people's gossip, Si Wutong thought clearly and got together with Ji Shuzhou. Both of them contributed to the country. Si Wutong received the mission before the two got engaged, but Si Wutong was seriously injured. Ji Shuzhou tried his best to save him, but to no avail. The emergence of the system gave Ji Shuzhou the opportunity to go back to the past. Ji Shuzhou returned to before the two got engaged and stopped Si Wutong from carrying out the mission. After the two got engaged, they resumed their work. Si Wutong received an emergency mission and died on the spot after being shot in the heart. Ji Shuzhou came to rescue him but it was ineffective. The system appeared, told Ji Shuzhou everything, and followed Si Wutong's last wish to erase Ji Shuzhou's memory. But Ji Shuzhou didn't want to forget, so he tattooed Si Wutong's name and the two's oath on his wrist (because the system erased everything about Si Wutong, including the diary). The system couldn't bear to see Ji Shuzhou suffer, so it restored his memory. Ji Shuzhou later returned to the city to work as a doctor and took care of Si's parents. He eventually died of old age under the sycamore tree at home.
The intention: to share their stories with everyone and tell everyone that love is what the heart desires.
