I Will Always Remember You

After a one night stand, he gave birth to the one he loved, but he was forsaken in the end. Even though his boy is weak but he, the father would be strong. 5 years later, she came back from the war and became a mother:
"What!? I have a child?" Should she cut the red thread of love off or reunite and earn the love back?
She slightly pulls his skirt up and said: "My darling? I already had one."