So i'm searching anything where there is working and jobs involved. Police, Cooking, Secretary, Business everything :)

Misaeng is a much watch for that! No romance though. Very professional lol

Here are some I have watched:

Arsenal Military Academy - Army along with some crime and investigating. Some romance

Come and Hug Me - Investigating, and crime. Romance

Go Go Squid! - Computer engineering (Is more interesting than it sounds lol), Romance with a singer

Love O2O  - Gaming company, Romance

Perfume  - Fashion. With a twist of fantasy and romance.

Psychopath Diary - Crime. No romance but so so good.

The Beauty Inside - Actress and a manager of a company.

Touch Your Heart - Law and romance

What's Wrong with Secretary Kim  - Owner of a company and his assistant

Intense Love - Two doctors. An actress an her assistant.

Lucky Romance - Gaming company

Melting Me Softly - Entertainment industry. With fantasy, Sci-Fi and romance.

She Was Pretty - Fashion magazine

The Brightest Star in the Sky - Music industry

love me if you dare - criminal investigation

a poem a day - doctors

touch your heart - lawyers

i can hear your voice - lawyers

Black dog - high school teachers , no romance and pretty realistic

Hot stove league - jobs involving managing a professional baseball team, again no romance 

Underwear - a lingerie atelier set as the main scene

Jimi  ni sugoi! Koetsu Garu Kono Etsuko - publishing company, the editing teams' activities, romance is minimal from my point of view

Chief Kim (or Good manager) - the accounting department at a big company, it's mostly a comedy

Try:

  • Misaeng +1  - a must watch on office workers in a trading company
  • Pretty Proofreader - work at a publishing house
  • Stove League - working for a baseball company and trying to make the baseball team successful
  • Good Luck - working for airline company
  • BG: personal Bodyguard  - as title suggest, bodyguards
  • Black Dog - teachers
  • Hanzawa Naoki - banking
  • Pegasus Market - marketing
  • Chief Kim - accounting
  • Auditor Nozaki Shuhei - auditors
  • Cops/police:
    • Secret Forest/Stranger 
    • Love me if you dare
    • Day and Njght
    • Black and white
    • Bitter Blood
    • Crisis
  • Medical Field
    • Hospital Playlist - doctors
    • Golden Time - ER doctors
    • Code Blue - ER doctors
    • Kounodori (1&2) - obgyne doctors
    • Radiation House - diagnostics
    • Nurse in action - nurses
    • A poem a day - physical rehabilatation
    • Brain - neurosurgery
    • Unnatural - investigative/forensic
    • Fragile - pathology
    • Surgeons - surgery
  • Legal/Law:
    • Hero
    • Diary of a Prosecutor
    • Nurse in action
    • 99.9: Keiji Senmon Bengoshi (1&2)
    • Miss Hammurabi
    • Suits
    • Best partner
  • Cooking:
    • Grand Maison tokyo
    • Midnight Diner (Jpn) 
    • Gourmet 
    • Pasta
  • Dr. Romantic (doctor, hospital)
  • It's Okay Not To Be Okay (nurse, writer)
  • Dinner Mate (media business, therapist)
  • Fight For My Way (sport, announcer)
  • Her Private Life (art business)
  • Itaewon Class (business food)
  • Just Between Lovers (architecture)
  • Mystic Pop-Up Bar (bar, restaurant)
  • Radio Romance (radio business)
  • Something In The Rain (business)
  • The Beauty Inside (actress, business)
  • The Secret Life Of My Secretary (business, secretary)
  • Touch Your Heart (secretary, lawyer)
  • While You Were Sleeping (lawyer, police and journalist)