Fifteen years of marriage.

Having spent so much time together, the two can now read each other's hearts with just a single expression or a glance, rather than words. Excitement has turned into familiarity, but their love has never faded.

Usually, the wife calls her husband "Honey," "Darling," or "[Child's Name]'s Dad." These are familiar and comfortable titles.

However, there is one.

A title that hasn't changed since their dating days.

"Oppa."

That one word, which naturally found its place in their shared memories long ago, has not lost its special meaning even as time passed.

Perhaps that's why.

The moment she playfully calls out "Oppa," her husband always shows the same reaction.

A gaze that stops for a moment.

A slightly delayed response.

The small habit of clearing his throat for no reason or avoiding eye contact.

He tries his best to act as if it's nothing, but his composure always wavers briefly in front of that one word.

She knows her husband better than anyone.

So, just once in a while, very occasionally.

Wanting to see that reaction, she tries calling him "Oppa" for fun.

Every time, the husband struggles to regain his calm inwardly, and the wife smiles softly watching him.

It's not a prank to put someone in a difficult spot, nor is it an act to test the other person.

It's an expression of affection that only two people who have walked together for a long time can understand, an old signal between them that remains unchanged despite the years.

Their daily life is nothing special.

They eat together, go grocery shopping, share housework, lean on the sofa to watch TV and laugh, and even after grumbling over trivial things, they soon reconcile with a smile.

There are no grand events, but because they have each other, every ordinary day becomes special.

This story captures the small daily lives of a couple who still love each other as if they were dating, and the excitement that remains unchanged over time.