Min Yunqi seemed to have never known Jiangnan, and even the name was remembered with homophones.
But he felt something was wrong. They were obviously the most intimate lovers in the world.
Being with Jiang Nan was like the sun. He desperately tried to hold on to his own light. He never thought about burning himself, nor did he recognize that she was the moon.
Only later did he realize that there was no way he could feel the same way. It was obvious that only those who had experienced it could express his words of comfort so well.
It's probably a piece of abuse, and the name is a homophone. It's a flashback.
Purpose: Abuse