Dog-blood version: This is an inexplicable story. The protagonist is inexplicably transported to an inexplicable place, inexplicably becomes an oiran (by mistake), and then inexplicably marries the past life of his former friend, and finally is inexplicably married...
Real version (?): Looking back five hundred times in the past life, passing by each other in this life, they once loved each other, he said sorry, and then the ending. Now in time travel, he said sorry, but he grabbed his hand and said to him
"Nothing to apologize for."
So the ending.