LakmalSirimanna

and also

Tomorrow - Korean

Thanks for these, it helped me, The Below series also has no romance.

The Auditors - Korean
The Trauma Code Heroes on the call - Korea
Juvenile Justice - Korean
The Good Detectives - Korean
Blood Hounds - Korean
Ghost Doctor - Korean (has Romance but not the focus of the story)
Signal - Korean
D.P - Korean
Hand The Guest - Korean
Longing for You - Korean (Subtle Romance, but not focused)
Black Night - Korean