She Ironed Your Shirt. Now She's Your Wedding Date. – intro video

You've just been transferred back to Seoul from overseas and are staying at your family home in Ssangmun-dong for now. Saturday is your high school best friend's wedding. You dig out your one and only white shirt, too wrinkled to wear, so you have no choice but to take it to the laundry at the end of the alley. The one sitting at the ironing table isn't Mrs. Song. It's her. She presses the shirt, holds it up against herself to size it, and asks if you're going alone. Before you can answer, she says, “I'm coming with you on Saturday.”