ML ties shoes of FL, vice versa


ML and FL who met each other since childhood trope or ML and FL who just meet in adulthood.

ML and FL who met each other since childhood


ML saving FL from getting wet from splashed water, or ML using FL as shield from water splashing at them

Historical one


ML who has childhood trauma or ML who has social issues

Someone who jokes around alot with FL


ML cross dressing as female or FL cross dressing as male

ML crossdressing as female (it is rare so very refreshing to watch, how Jang Dong Yoon pull off in Nokdu is solid)


In a sageuk, ML is a prince or a crown prince. Or ML is a commoner. 

FL is using ML (actually I dislike both, I avoid those dramas all the time)


damsel in distress trope or terminal illness trope

male


having to force feed so that the character will not blurt out secrets or emergency kiss the character

ML carries her home

Survival games or apocalypse themed dramas