Recommendations Female lead as subtitute of the male lead's first love

I want to read romance of when the female lead realize that she actually just the substitute of the male lead's first love. Then they break up and male lead had to choose his first love or the female lead. Finally choose female lead. It be very good if it in entertainment circle (where this story fit the most).

Or it would be good too if the female lead end up with second male lead if the male lead choose his first love.

Either one was interesting to read.

 

My instant thought is:Reborn as my Rival's Wife
Fits the substitution, there isn't much of a choice rather than a moving on from the past process for the Male Lead
Genderbender theme though

Edit:
The Marriage of Convenience tag seems very helpful.

 

Why not the reverse ?
Sinister Ex-Girlfriend Ch 36 - 59.
Mc is the ml first love, he choose the fl (mc's substitue when she's gone). But mc wreck havoc the story.

 

Done reading this, so funny

 

I read this too. But it not my cup of tea, the plot is awesome and the character is cool but when i pass 200 chapter,i felt bored

 

The Male Lead’s Substitute Wife