Please help me find this drama...

So I remember in lockdown 2020 I came across one long family drama maybe and the description was not upto my taste but then I read in the comments that secondary couple were too much interesting to drop this drama.

Their story was something related to fake marriage or girl in love with the guy for a long time and then he notices her...something like this.

I remember it was a long drama because I hesitated too much to start it.

Can anyone guess what drama it might be?

For no confusions, I've already watched four family dramas with secondary couples with same troupe-

Okakgyo Brothers

Our daughter, Seo Young

Ugly Alert

My Golden Life

Wolgeyesu Tailor Shop

Or can you please recommend me long family dramas with the same troupe of girl in love with the guy for a long time and they end up together. Can be a secondary couple too...

Thanks!

Maybe: 

• What Happens to My Family ?
• Once Again
• Five Enough

As previously mentioned,  Father is Strange seems to fit 

 ArniA:

Try to think of more information to help narrow it down:

Country of origin

Number of episodes (16, 24, 50, 100?)

Possible release years (is it very new, or maybe 5-10 years old)

I don't think this drama matches, but sometimes you can check up on the recommendations sections of similar dramas to see if you find the one you're looking for:
My Father is Strange    

try search with these filters:

https://mydramalist.com/search?adv=titles&co=3&ge=29&ep=45,65&so=popular

Thank you but I'm sure it is not Father is Strange. That drama was not my cup of tea so dropped it. Also the drama is kind of old, maybe below 2016 and is a korean family drama with either 50 episodes or 130+ episodes. Don't know which one though.

 Little Cherry:

Can you tell me which secondary couples in Father is Strange have this storyline where girl is in love and guy notices later in the story? 

It's the actors Lee Joon and Jung So Min. The story is that he suddenly becomes her half-brother and moves in with them, and she starts developing feelings for him, but gets so torn because she's in love with her half-brother which is incest and she falls into total misery.