My Ex Knocked on My Door Late at Night, but It Was Her Sister

Synopsis:

Main characters: Lin Yi, Su Yao

[Older sister has been plotting for ages + younger sister regrets chasing her husband + love triangle showdown + marriage first, love later + multiple twists]

On her wedding day, Su Ran abandons the groom for her first love.

To save the Su family’s reputation, her older sister, Su Yao, takes her place as the bride.

Everyone assumes it’s a humiliating transaction: Lin Yi is nothing but the Su family’s castoff, and Su Yao is a poor soul forced to suffer in her younger sister’s place.

Su Ran is certain Lin Yi loves her. All she has to do is come back, and he’ll surely beg her to take him back.

Not long afterward, Su Ran falls out with her first love. Heartbroken, she gets drunk late at night and knocks on Lin Yi’s door.

But the one who opens it is her usually cool and distant older sister, Su Yao, her hair damp and loose around her shoulders, her robe hanging open. In a hoarse voice, she says, “Looking for him? We’re in the middle of our wedding night.”

Su Ran is struck as if by lightning, instantly sobered up. It turns out she’s the one who regrets the breakup.