When they were five years old, they agreed that Su Kui would become a doctor when she grew up and would cure Chen Su's stomach problems.
Chen Su grew up to be a soldier and protect Su Kui.
Something unexpected happened at Chen Su's home, and he never came back as soon as he left.
And neither of them forgot that agreement.
Later they met in Africa, Chen Su was a soldier and Su Kui was Doctors Without Borders.
"Hello, I am Doctors Without Borders, Su Kui."
"Hello, my doctor, I am the captain, Chen Su."
Purpose: Love and Peace