After I Transmigrated into a Book, I Took My Sister's Place and Married the Tycoon CEO

After transmigrating into a book, Qin Chuan discovers that he is a cannon-fodder male supporting character, the kind who schemes against his younger sister, the heroine, and ends up being thoroughly crushed in return.

To save his own skin, Qin Chuan eagerly strives to be a model citizen, builds a good relationship with the heroine, and tries to live to a ripe old age.

But...

What do you mean by a political marriage between the families? My sister has to inherit the family business, so I have to marry into another family?!

As a second-generation rich kid in name only, Qin Chuan is forced to register his marriage with a genuine, powerful tycoon.

Qin Chuan thinks it's a marriage of convenience, but who knew the tycoon would turn into a wolf in the middle of the night and devour him whole?

Crying Qin Chuan: Wait, this isn't how the story goes!

The powerful tycoon has been secretly in love with Qin Chuan for two lifetimes. In his previous life, he died without ever seeing Qin Chuan return from abroad. Now that he's reborn, he is determined to pamper Qin Chuan until he's one of a kind in all the world.

So the first step in winning him over is teaming up with Qin Chuan's secretly brother-obsessed younger sister to coax him into marriage.

The tycoon: If you run away, you're abandoning your husband and child. You're a scumbag.

Qin Chuan: ...

Qin Chuan: I kicked up a fuss and caused trouble every day because all I wanted was a divorce, but then... well, it turns out I love it.

A transmigrated character who thinks he's cannon fodder but is actually a pampered model citizen uke x a reborn, scheming, powerful tycoon seme

A ridiculous, melodramatic idea I've wanted to write for a long time. Feel free to add it to your reading list.