I would also like to list certain manhwas/manga that I've read and I believe that has no novels its based of. It'll be few but I'll add it for sure if I encounter more. 

1. I Stan the Prince - Very funny. Superior art. Amazing couple.

2. Rumor Has It (Indonesian Webtoon). Cool FL. Very touchy ML--that's his love language hahaha. There's certainly trigger warnings so look out for those.

3. A Beloved Existence. Sweet, but I haven't finish reading yet. 

4. Sesame Salt and Pudding. You guys might know this already but its also one that fits the bill perfectly. She's so clingy and he's so indulging! (plus, older guy, duh). Its manga, btw. 

5. Lady K and the Sick Man. Sadly, just a short read buttt very sweet and there's a lot of smut (its mostly smut)

6. Superstitious Nine. Smut heavy but sweet. A kinda manipulative cinnamon roll ML hehe.

7. QQ Sweeper. Another manga. Good read so far. This is quite short but remember there's a sequel and that one is a lot longer.

8. Loving Yamada at level 999. How did I not think of this immediately hahah. Lots of skinskip. (Manga). 

9. Neko to Kiss. Cat lovers, its your time to shine. We have a cat shifting ML here hahah. 

10. Osananajimi Bartender to Hajimeru Kaikan Lesson. Friends to lovers. Cutiesss, they're very sweet to each other (its smut btw). 

11. Ai ga Omoi Kishi Koushaku wa, Tsuihou Reijou no Subete wo Ubai Tsukushitai. Very light read so far, sweet and with hot smut (hehe). The FL also like the seggs a lot and quite vocal about it. The ML is possessive. (manga) 

12. Heartbeat Conquest. I can't find any novel so I'll put it here. This is a reverse harem and a good one at that. The FL is living the ultimate dream of creating her own harem hahaha. Yup, that's her goal so she mostly takes initiatives. She's very likable and smart. She's got lots of rizz, its no wonder her MLs fell for her. The said MLs are eye candy too and likable. The art is super pretty, I especially love her eyes. They said its emerald but I don't think its quite that. Anyways, read this cuz its a lot of fun. (you can read it on webtoon) 

13. Sakaki the Lazybones Shows His Talents at Night. I gotta add this. This is one of the better smut I've read in a while.  Just a sweet, hot, love story between coworkers. They actually talked to each other to resolves issues and no s*upid love rivals, thank christ (there's an ex but he's got like one panel when he showed up, that's it). This focuses more on their relationship and their s*x life. Both MCs are likeable. Solid 10. Oh, and fl is 5 years older than ml mwahaha hope that convinces u (24 and 29).

14.Coffee Prince and the Sleeping Beauty. So short and so good. Love that the author decided that this manga doesn't need love rivals to progress things. Showing their progression as a couple is what the readers want. Salute.