Min Guo Da Zhen Tan (2022)

Similarities:
•Set in The republican era (1930s Tianjin)
•a group of 2 guys and 2 girls investigating cases (and no the girls aren’t annoying ! )
•Both IQIYI dramas

What’s different:
•this one is more on the fantasy type

Similarities:
-Both have very smart leads and support that help each other no matter what. They treat each other as equals.
-Both are Republican era murder/mystery solving dramas.
-Both have comedic elements and banter amongst the entire cast.
-Romance is present.
-Each case is concluded successfully and through much understanding of evidence.

Also adapted from a story by Agatha Christie although the time setting differs. Miss Ma, Nemesis takes on a modern times setting without losing the Agatha Christie tone which someone referred to as 'the puzzle, solving the mystery'.

Both set in a similar time period , mid 1920s and 1930s , both having some Agatha Christie inspiration, smart male and female leads . Well written cases and good pacing .

Police officer Pang Hong Mei amid the many obstacles created by U.S. and Jiang spy agents, rescued Ji Danyang, a patriotic scientist who returned from the United States from the enemy spy. She accompanied Ji Danyang to Lumen City to participate in the "Water Drop Project". Enemy special forces formulated a sabotage plan codenamed "Operation Rock" and concentrated their forces and tried to destroy the "Water Drop Project." Pang Hongmei and Ji Dan Yang fought a life-and-death battle with enemy agents in Lumen, thwarted the enemy's conspiracy, protected the "Water Drop Project" and finally achieved the expected success. The couple who went through the test of life and death, also realized their dreams and firm ideals.

They are based on each other as part one and part two
same two male lead in both
same republican era

Same male lead in both
same republican era in both
same fighting by smartness in both
they have amazing bromance ,,male friendship
also have good romantic stories not heavy on the romance