Su Huijin knew that his arranged-marriage partner, Jiang Yuning,
had a beloved first love who had died.
He knew because he bore a slight resemblance to that person.
So Jiang Sining agreed to the marriage after seeing him just once.
After they married, people mocked him as nothing but a substitute, saying that Miss Jiang would divorce him sooner or later.
But it didn't matter. He could be a substitute.
He would consider it repayment for the kindness he had received all those years ago.
Happy ending.
(The male lead isn't actually a substitute; there's a misunderstanding.)
