MTL - Full Marks Hidden Marriage - Chapter 5 Little Master found it.

When Cheng Qianfan opens his eyes every day, the first reaction in his mind is: What is my identity today (which vest should I wear)?

This book is also known as “Ace Agent: My Vests Are Countless”.

The red ‘flame’ hidden deep inside the enemy, the agile and outstanding member of the red team ‘Chen Zhou’, the favorite general of the military commander Dai Chunfeng, the blue bird… and so on.

However, he knew that he was Cheng Qianfan, a staunch red warrior!

“In the dark, you firmly watch the sun in your heart; in the long night, you silently give birth to the dawn of dawn; in the tiger’s den, you bear the burden of humiliation and wait for the time; in the battle, you rise quietly, killing the enemy invisible; no one knows your name , your feats will be immortal…”

His story begins in the early spring of 1936…

- Description from novelbuddy

What would you do if you were reborn in the world of Battle Through the Heavens without a distinguished background or an elder in your ring and just a decent talent?Luckily, Xiao Ming has awakened the Life Simulator System![The Life Simulator is on]......[You have experienced an ordinary life.][Elements are being chosen.][Currently available: Green Lotus Core Flame, Flame Mantra, Woeful Poison Body.][Please choose one.]Every seven days, he can choose to extract one of the elements from his life simulation.In this way, Xiao Ming began his ordinary life.

Genius prodigy ​Ji Yu married the icy ​CEO Gu Yan out of gratitude, assuming their union was a temporary transaction. Wrong. While she breezed through their sham marriage, Gu Yan—her “husband-in-name-only”—quietly rewrote the rules.Post-divorce, Ji Yu thrives: clubbing with models, sipping champagne, and flaunting her freedom. ​Post-divorce, Gu Yan implodes: stalking her parties, hijacking her dates, and growling, “Try replacing me. I dare you.”But fate laughs at their feud. On the night their divorce is finalized, a reckless encounter ignites—hotter, messier, and utterly unforgettable. Now Gu Yan, the once-detached tycoon, is addicted to the wife he never truly let go.“Marry me again. Legally. Shamelessly. Forever.”“No. But thanks for the one-night souvenir, Mr. Ex.”

Ye Xi crossed over into a typical idol romance novel as the villainess.

For the sake of her safety, she decided to distance herself from the male and female protagonists while silently observing their real-life version of a school idol drama. Everyday, she would repeatedly ridicule the main protagonists in her thoughts, along with their group of friends and fans.

It’s not surprising, however, that the male protagonist’s special ability is to hear the voices of other people’s thoughts. So he listened to all kinds of curses that Ye Xi secretly harbored and recorded them one by one.

Expressionless Male Protagonist: the future is long, your debts will slowly be collected.

Ye Xi covers her ears: I’m not listening, not listening, *recites Wang Ba’s Sutras*

- Description from Novelupdates