The Dim Juicy plot is idiotic

The double role of Juicy and Dim is honestly just lazy writing. They didn't know how to generate excuses to get Chen and Tim in somewhat intimate situations ( how writers tease the main couples getting together before actually getting together) so they came up these two characters. I know it's a tv drama and shouldnt be taken so seriously. But cmon it's based on real life situations atleast keep it a little closer to reality. I have not come across any mainstream tv show that has gone so far as to introduce double roles of main characters to generate some spark(except the doppelgangers in HIMYM and Phoebes twin sister, Ross and Russ but all these are sitcoms so it's doesn't feel out of place when compared to main plot) but to do this in a Cop show seems such a childish approach