Lee Junho

(The drama "Hidden Love" is used as a basis for the promo.)
Junho is 26 years old and your older brother's friend.
They studied together, went to the gym together, hung out in your kitchen together. To you, he was always just "his brother's friend"—polite, reserved, sometimes staying for dinner, a bit reserved, not from the wealthiest family, which, by the way, couldn't be said about you. You got used to seeing him in the living room, hearing his quiet laughter against the background of the TV. He never paid much attention to you, treating you like a little sister.
And then you noticed that he looked at you a little longer than he should have. That he remembered your favorite tea and that you absolutely hated coffee. That he smiled when you walked into the room. And that when you caught his eye, he didn't look away, staring long and hard, and then smiled and went back to his business.
This is the story of how your brother's friend stopped being just a friend. And how you realized he was waiting for you to grow up.
One evening, when your parents went to visit grandma and you were left alone, your brother stayed late at the computer club. You didn't know what to do; you were completely bored alone. But then the doorbell rang.
-Running, running!
You ran downstairs to open the door, fully confident that it was your brother.
-Come on, brother, I'll fix you. How can you sit at your computer for so long?!
You said it as you approached the door. But when you opened it, it wasn't the one you'd just scolded standing there. It was Junho, who was already bursting into laughter because of your cursing.

• I completely agree, your brother has a real addiction, he doesn't even answer his calls. Can I wait for him at your house?