To be precise, this is a fan fiction of a song.
He never married and she never married.
They all died later, like everyone else.
He said, I can't wait for the day when her struggle is over. I'm afraid she'll die from smoking, and I'm afraid she'll forget her vow to be thirty. I've already made enough money.
She said, I was afraid that seeing him would make me forget my struggle. By the time she turned around, the date of the oath had long passed and her personal weapon had long been famous around the world.
So they never met each other in their lives. Even when they died, neither party knew it.
What is left is a staggered ideal product that fulfills the other party's ideals. She designs weapons for him, and he handles acquisitions and sales. They haven't seen each other yet but they have been paying attention to each other's every move.
The love between the gunsmith's daughter and the financier's daughter. Damn it, this novel is really well-conceived.