CDrama request (forgot name)

I can’t for the life of me, remember this cdrama. It’s an older woman/younger man one, where they’re childhood friends, and the man has now returned as a successful solo idol, though he isn’t acted by one. He calls her “wifey” and stuff, and even moved in with her, but she only sees him as a friend etc at the start. They’re both the same height, and the female lead has hair around her neck length, one scene I can remember, is she does a speed dating thing on a train carriage with a friend.