Male Lead Falls First and Chases First

1a

1a, 3

cw toxic ML, forced kiss

1d

kind of 4 and kind of 1a

this drama is not a perfect fit for this list because the FL is in a parasocial sort of love with the ML right from the start, but he does like her even before she becomes his fan 

1a (1d but FL doesn't remember)

1d

1a

1a

1a

1a

1a

1a

1a

2, 3

1b - SML

1a, 1d (but FL doesn't remember)

1a

1a

1*

1d - not sure if the ML always loved the FL even when they were separated... but clearly he's always been madly attracted to her.

2

3

by ML here I mean Wen KeXing

2 - there are three men in love with the FL, one of whom has loved her since childhood

You could argue that the ML and FL fall in love at around the same pace, but ML shows his feelings much earlier through possessiveness, getting flustered around her, etc

3

by ML here I mean Lan Wangji/Lan Zhan - he falls long before Wei Wuxian

4

4

1a

1d - ex-lovers, ML is still hung up on FL

1c ish - they were closer than family as kids but don't recognize each other as adults even though at least the ML is still very much hung up on the FL, unclear how the FL feels about him during their separation

1* for SML who plays a big role in the plot

2

1a - for all her husbands (she has many)

1a - ML fell for FL in college, she doesn't recognize/remember him

1b - the ML is a rom-com hero in love with the main character of his drama, into whose body the FL jumps. He's really relentless about chasing her

1a - FL rescued ML prior to start of the drama