He's matured,rich and handsome.She's childish,rich and pretty.

Sunmi is a childish person who still believes in santa claus since she's a child and thinks she's still young.Opposite,Nickhun is a matured person who doesn't believes in santa claus and only earns money.What if they had to live together and marry with a contract.

Sunmi

Aged 20.

Still believes in Santa Claus.

Childish and loves to prank.

Works at a big company.

Nickhun

Aged 22.

Doesn't believes in Santa Claus.

Matured.

Handles his father company.

Seungyeon

Aged 22.

Nickhun's girlfriend.

Hates Sunmi so much.

Dongwoon

Aged 19.

Sunmi's little brother.

In love with Jiyoung

Jiyoung

Aged 18.

Nickhun's step sister.

Also childish like Sunmi.

In love with Nickhun

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Happy Early Christmas !