Had he not given up on his girlfriend due to his family pressure back then and married his current wife, Wufeng's mother wouldn't have died, and they could have been a happy family.
But there were no 'ifs' in life. He had chosen to follow his family's wishes, unknowingly abandoning his pregnant girlfriend. He didn't know he had a son until years later, when he found out his girlfriend had died during childbirth.
When he met his son for the first time, the boy was already old enough to understand things. He was so thin and his body was covered in scars from years of abuse and bullying.
He still remembered that when his son learned that he was his father, his dull eyes were filled with blame and hatred. It took him three years to finally convince his son to come back with him.
Wufeng came to the Guan family at eight, but he never called him 'Father'. In his son's eyes, he is not his father, but the person who abandoned him and his mother.