I also want to knowI want movies like "Devil beside me"(this is a drama) etc
I mean when the mais or father get marrige with a person that have a son/daugther
You can try this one, it has both a drama and movie adaptation .... :o)
Marmalade Boy -Drama
Marmalade Boy - Movie
Definitely check out Marmalade boy (movie) not the drama.
But for dramas:
If you don't mind older dramas: Piano
this IS precisely describe Marmalade Boy
and the best part is that at one point they thought they were actually related by blood
https://kisskh.at/27225-tra-barb-see-chompoo
https://kisskh.at/20362-ani-ni-aisaresugite-komattemasu
Transit Girls (it's step sisters in love though)
I really don't remember correctly but still recommend:
https://kisskh.at/10228-kehas-see-dang
https://kisskh.at/23894-luerd-ruk-toranong
https://kisskh.at/9868-taddao-bussaya
https://kisskh.at/10174-suparb-burut-satan
My golden life
My healing love