this or that (drama tropes edition)

FL is the brain ML is the muscle  ( Delightfully Deceitful  )    

nerd FL or nerd ML

lead character has a second made-up identity

Fated Reincarnation  Love  OR  Unrequited Love

love triangle

love triangle or love quadrangle (two triangles but with the possibility that the leftover two could end up with each other)

amnesia

boring, no personality ML or cold but sweet ML

ghost

main character has a terminal illness, or main character incorrectly believes that s/he has a terminal illness

Music

Cheater ML or Cheater FL

age gap but on the smaller end (no more than 5 years)

flirty & confident FL or ML