Some popular ones are 'True Beauty' and 'What's Wrong with Secretary Kim'. They're popular because of their engaging storylines and relatable characters.
You can try some adult-oriented comic websites. But be aware that accessing such content may have legal and ethical considerations depending on your region.
Some popular platforms to read manhwas are Lezhin Comics and Tapas. Both offer various genres and stories to choose from. Also, you might find some on Naver Webtoon, which has a large user base and a diverse range of titles.
You might find manhwas on apps specifically designed for comic lovers. Check out apps like Tappytoon. Also, some libraries might have digital collections of manhwas that you can access with a membership.