https://www.novelupdatesforum.com/threads/became-the-sister-in-law-of-a-young-yandere-%EC%96%B4%EB%A6%B0-%ED%9D%91%EB%A7%89%EC%9D%98-%ED%98%95%EC%88%98%EB%8B%98%EC%9D%B4-%EB%90%98%EC%97%88%EB%8B%A4.136898/
I don't remember anymore so I'll leave this here in case you wanna look through... You can check out the other comments as well... They have better explanation/spoilers... Sorry I wasn't much help

... The art for FL is getting childish her dresses and hairstyles are getting ridiculous for her age!!? I'm just saying that it didn't sit right with me... Don't mean to bother others. And the spoilers I read seems to have some disgusting twists in the past ╥﹏╥ I don't know if I should continue.