The name of the injection is 흉살 주사(hyungsul jusa), which is often used for scar treatment in Korea.I was recommended this injection in exactly the same condition as you. I was told that I can only use it up to 3 times because it is steroid, but I can't expect much effect.
I went to several hospitals for counseling, and they told me that I should support my nostrils firmly with my own ribs because my skin is thick.I hesitate to undergo surgery again because of the cost and the burden of my body.Your nose is very natural and you have the option to compromise if you don't have a functional problem.