Xu Huan exchanged his innocence and half his life for his mother-in-law's life and Lin Ke's future.
In the end, all they had to do was wait for Lin Ke to say "brother and sister are worthy of each other".
*
Shen Dunian bought Xu Huan's life with a cold deal.
At that time, he thought, the money has been paid and the two have nothing to owe each other.
Later, when we meet again, he always thinks about it.
That night, he shouldn't have left her alone in the blood.
When she was dying from childbirth, he should have said "Thank you" outside the door.
Unfortunately there is no if.
Concept: Life is in tatters, we mend it.