An Shi knows that Fu Lingci doesn't love her. He married her only because she looks somewhat like his first love. Still, An Shi can't help falling for him. Her heart began beating for him the moment they first met twelve years ago. When she married Fu Lingci, she was filled with joy, never knowing she was only standing in for someone else.
Fu Lingci had a first love he hadn't seen in years. Because of his mother's interference, they were forced apart, and his beloved went abroad. Later, he accidentally rescued An Shi, recognized her at a glance, and brought her home as his wife.
Angst first, sweetness later; marriage before love.
The male lead may be a bit of a jerk, so feel free to lay into him.
