Show Off Once in Every World - Chapter 607: Three Year Itch XLXVI

As a walk-on, he had been the mistress of his sugar daddy for three year. However, they only had met each other for a few times.
As a boss, his sugar daddy had tons of lovers.
The walk-on: The cake shop is the only thing I love in this world. Lovers? Never want one.
The boss: No problem. Nobody wants that.
Then, they fell in love with each other…
Shameless playboy x heartless rogue
1v1, this is not a decent love novel.

- Description from Novelupdates

Haruma Kazuki is a cursed (or maybe just deeply unfortunate) high school student whose lewd, panicked, or absurd thoughts literally manifest in reality — especially when he tries not to think about them. The more he denies or avoids feelings, the more chaotic and trope-heavy the consequences.

Love between a girl living a lie and the girl who can turn lies into truth.Lin Roen was just another broke, burned-out job applicant - until a simple error landed her in the CEO’s office of the most powerful corporation in the country. Now, the world believes she’s the heiress of the Roen Group.As Lin stumbles through a world of luxury, manipulation, and corporate worship, she is relentlessly pampered by those who believe she’s their salvation. Everyone bows. Everyone obeys.But nothing is what it seems.Lin soon starts to feel that there is something sinister behind the mirrors of lies.Trapped and revered in the corporate world that blends religious fervor and heartless capitalism, there is only one person she can trust - Luc, her perfect assistant.* A slow-burn psychological drama wrapped in corporate satire, mistaken identity, and a love story between two girls on the edge of lies and truth.

To treat her sick brother, she was forced to marry him in place of her cousin, who was disfigured and paralyzed. At first, their relationship was purely transactional, with neither caring much for the other. But after going through a lot together, they fell in love with each other. He doted on her deeply.She was considered an ordinary person by the world, but it was later discovered that she had multiple identities - a mysterious underground boxing champion, a highly-skilled doctor, and a mysterious and renowned composer... He also realized that their fates had been intertwined long before they met.