the FL falling and being caught by the ML

a vocal quirk from the main character

miscommunication

Secret where everyone knows 

a whiny character :|

Lead with strong sense of humor

a small bit of a conversation overheard, which gives the total wrong idea of someone's feelings

The leads always have family problem

shower scene in the first episode displaying the ML's muscular upper  body (but often stopping at his jaw line)

surveillance cameras playing a part (attached to buildings, cars, etc.)

someone getting slapped

the FL wearing very high heels even if her job often means that she has to run