When Gu Nan first met Jiang Ran, he was being bullied. Gu Nan helped him, and the two helped each other. However, Gu Nan needed to go abroad for treatment due to physical problems, but he was afraid that Jiang Ran would worry, so he didn't tell him. He only left his brother's story behind. Jiang Ran searched frantically, but only got the sentence "She went abroad, don't look for her."
"At this troubled age, I encountered a ray of light, so I decided to chase the light, become the light, and spread the light."
Intention: Love till death.