Lou:
maybeeee;
Weightlifting Fairy Kim Bok Joo
Shopping King Louis
Find Yourself
Secret Boutique
Mother of Mine
Sweet Stranger and Me
I agree with Weightlifting Fairy Kim and Mother of Mine. I can also recommend:
Search: WWW one of the couples fit the description, though it happens many episodes in.
Ms. Temper & Nam Jung Gi meek, submissive, low self esteem ML, competent, short tempered, bossy FL. The romance is not really center stage.
Protect the Boss he's meek, but also spoiled and lazy. She's a hardworking, super strong bully (only to him).
My Fated Boy he's like a puppy around her. She's older, competent and very protective of her rookie 'little bro'.
Fighting Youth well I'm cheating a bit here. One of the FL's lover is younger, brighter and puppy-like, while she's sophisticated, a little bitter and a business badass. That said, I wouldn't call him submissive or clumsy.