I Became My Best Friend's Sister-in-Law, and Her Fierce Brother Calls Me His Darling Every Night

[Both leads are devoted only to each other + sweet romance + lighthearted everyday life + a powerful man humbles himself for love]

Bright, sweet girl-next-door vs. a CEO who’s a gentleman by day and a madman by night

Ni Yin is being pestered by her scumbag ex. Her best friend suggests that the best way to get over the old is to find someone new, and offers to set her up with a date.

Ni Yin agrees, goes to meet him, and efficiently gets a marriage certificate with someone right away.

A few hours later, her best friend calls to ask how it went.

Ni Yin: “We’re already married!”

Her best friend gets a bad feeling. “Married? Wait right there!”

In the blink of an eye, Ni Yin receives a photo her friend sends of her cousin, still waiting alone at the café.

Everything goes black.

The man she registered her marriage with wasn’t him!

Ni Yin plops down on the steps and listlessly opens her best friend’s voice message request. “Hey, how could your cousin be late...”

At the Civil Affairs Bureau, her best friend wails as if she’s the victim. “Yinbao, I’m guilty! I’m so sorry!”

Ni Yin comforts her. “The man I accidentally married is even more handsome than the one you meant to set me up with. He’ll make my ex even madder.”

Her best friend cries even harder. “I don’t believe you. Show me a picture...”

Ni Yin: “I... forgot to take one.”

Her best friend: “It’s on the marriage certificate.”

Ni Yin: “My husband... took it.”

The big brother her best friend talks about is rigid and stern, fierce and no fun. He’s the sort of man any woman would run from, destined to stay single for life.

That is, until she sees Ni Yin’s considerate, gentle, doting husband, and realizes he’s her actual big brother. Her brain completely crashes...