I also want to know

I 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:

  • Triple
  • Tree of heaven
  • Muean Khon La Fark Fah
  • Sassy Go Go

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

Transit Girls  (it's step sisters in love though)

I really don't remember correctly but still recommend:

  • Be with you (2017)
  • Season Love

My golden life 

My healing love