
You do NOT need a reason to turn someone down. The other person should respect your decision, instead of continuing to push for a relationship. Kusaba is out of line with the way he harasses Suzumi. "No" is a complete sentence.
Referring to this: http://www.mangago.zone/read-manga/noboseru_karada/mf/282816/Vol1_Ch2/pg-14/

Its not the person rejecting its the person receving the rejection has the right to know, as in why in the world the one fir whom you put up yourself bare and proposed is not doing rejection with out being sincere

IOTR, that was said wonderfully.

Beautifully said. I was asked by someone to give my reasons for turning them down and my answer was just, "No." Pushy people make themselves less likable.

A bit of a disappointing read. I always thought Korea's gender norms were too strict. What's wrong with a girl having short hair, not wanting to put on make-up, and wearing suits instead of dresses? When Ji Woo said she felt this way, I thought it'd be great if she could keep living like that, and was disappointed when Big Kang got all panicky about it. On another note, this story just kind of feels shallow.

Asians do not cut their hair. It is a sign of respect to the parents. Particularly girls. Femininity is highly desired. Probably because of Confucianism. I couldn't learn martial arts. When I cut my hair, my parents were pissed off.

I'm Chinese, and this is certainly not true in the modern age, lol. I also studied martial arts along with my brother growing up. Your family seems more old-fashioned than the norm. But I agree that femininity, acting "lady-like," is highly desired, especially in Japan and Korea. China doesn't seem to fixate on this as much.
I love this premise--"there are some people in the world you aren't allowed to fall in love with" because it's so realistic, and the story isn't handling it in a scandalous "forbidden love" way like some do (i.e. wrt incest, teacher-student, etc).