Initially another one of those reincarnated-as-the-villain stories, yet it gains a rather interesting twist within which enriches it beyond the standard machine generated variations that are now more common than the stars on sites like Webtoon. Your standard "good guy wakes up as a evil sect" is present, but one of the things that Reincarnated as an Unruly Heir does manage to do is keep the story entertaining even when setting up the story that comes next and introducing the mysteries surrounding the original "villain" in this sense... and in an actually timely manner in comparison to others like it, it both introduces and theneventually addresses them. The characters are charming, the art is solid, and the story is good even without relying on the "twist".

Is it the best manwha I've ever read? No. But it is entertaining enough where the attempt to dig deeper might turn out to be worth it. The best advice is to see if you can enjoy it without having to wait for it to "get good"; as with these things, you enjoy it or you don't.