Word-Drama or Movie Association

The Princess Gambit (ML is a huge red flag) 

Only for love (FL and her friend a big red flag)

Duped

Story of Pearl Girl 

Waterfall 

I'm glad you included the search results. I never knew what's what it is called.

Bon Appetit Your Majesty (the king's consort gets angry and plays it vigourously till the string snaps and cuts her finger)

The Untamed (had to search this up because I couldn't remember a cdrama off the top of my head.)

Live/broadcast

Undercover High School (a tunnel with a room hidden underground is discovered below the school)

Fall

Learning To Love (FL's fiance pushes ML down some stairs and he breaks some of his ribs.)

Opposites attract

Oh My Ghost Clients 

Ghosts

Falling into your smile 

Travel