I'm in search for a good romance manga that is not silly as shoujos.

Easy:
Emma
Ore ga Doutei o Sutetara Shinu Ken ni Tsuite supernatural elements
Solanin
Natsu no Zenjitsu
Yesterday o Utatte
Otoyomegatari
Ai yori Aoshi
Spirit Circle supernatural
Hetakoi
Chobits sci-fi
Moteki stopped updating 🙁

I'd suggest 3 Level Combination, Avant-garde Yumeko, Bitter Virgin, Bonnouji, Can't See Can't Hear But Love, Fuyu Hanabi, Hoshi no Furu Machi, Kami-sama ga Uso o Tsuku., Koibito Play, Melo Holic, Octave, Toshiue no Hito and Yuureitou

I've been reading Kannou Sensei. It only has 4 chapter at the moment, but it's still good. You may also want to look up Harlequin manga, too.

Hachimitsu to Clover

For some reason i'm remembering those plebs of MAL who would suggest School Rumble here (which felt a like a bad gag manga to me) lul.

Sekine-kun no Koi
Serendipity
Cheonsaeng Yeonbun
My Pre-wedding
My Heart is Beating

BTW not blaming someone for poor suggestion or anything. Just feeling nostalgic to that mature word.

Quote from Marfi09

For some reason i'm remembering those plebs of MAL who would suggest School Rumble here (which felt a like a bad gag manga to me) lul.

Sekine-kun no Koi
Serendipity
Cheonsaeng Yeonbun
My Pre-wedding
My Heart is Beating

BTW not blaming someone for poor suggestion or anything. Just feeling nostalgi ...

Marfi09 thank you for suggesting such a great read 😁
My weekend was GREAT thanks to you 😀

Akagami no Shirayukihime
Chuan Yue Xi Yuan 3000 Hou
Fushigi Yuugi - Genbu Kaiden
Horimiya
Keishichou Tokuhanka 007
Sora wa Akai Kawa no Hotori aka Anatolia Story or Red River
Akatsuki no Yona

Nothing is Eternal but Eternity
Enjoy life as much as you can and do whatever you want, because it may be only one.

Quote from Titra

Marfi09 thank you for suggesting such a great read 😁
My weekend was GREAT thanks to you 😀

Baka Manga helped me a lot when I was a noob manga reader. Just trying to return the favor 😀