This one...hekp pls

So ive been searching for this one webtoon/manhua im not sure what they count as its been a while since i read it.
There were twins the sister is an idol/singer and the brother used to be an idol/singer too he was like a child prodigy but he gave up on it after an incident i think it was about his voice but he sometimes switches places with his sister and cossdresses as her and attends to various events instead of her when she cant or lazy
PLEASE HELP ME FİND İT İM SEARCHİNG FOR İT FOR A WHİLE..İM GONNA CRY AND NO İTS NOT OSHİ NO KO NOT EVERY İDOL TWİN İS OSHİ NO KO（/TДT)/