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